10 Medieval Advisors Who Had More Power Than Kings

Forget crowns and swords. If you really wanted to rule the medieval world, you didn’t need royal blood; you just needed brains, boldness, and a well-timed whisper in the king’s ear.

Throughout the Middle Ages, plenty of so-called “advisors” did more than advise. These medieval advisors rewrote laws, ran kingdoms, pulled strings behind velvet curtains, and occasionally became the power behind the throne (and sometimes in front of it). Some were saints. Some were schemers. A few were glorified accountants with ambition.

Behind every dithering king stood someone much shrewder, an advisor pulling the strings, balancing the budget, or quietly orchestrating a bit of “necessary” treason. In an age of poisoned goblets and battlefield betrayals, it wasn’t always the man on the throne who called the shots. These ten medieval power players might not have worn crowns, but they damn well ruled.

10 Medieval Advisors Who Ruled the Middle Ages

1. William de Longchamp – England’s Uncrowned Ruler

William de Longchamp was the son of a Norman knight with no great pedigree. He rose through the church ranks at rocket speed, thanks to two things: fierce loyalty to Richard the Lionheart and an eye-watering talent for self-promotion. By the time Richard became king in 1189, Longchamp had scooped up three of the most powerful jobs in England: Chancellor, Bishop of Ely, and Justiciar. In modern terms, he was secretary of state, head of the church, and acting prime minister, all at once.

When Richard swanned off to the Third Crusade, he left Longchamp in charge of England. Bad idea? Well, depends on who you ask. Longchamp ruled like a king in all but name. He issued royal orders, fortified castles, threw nobles in jail, and refused to consult with anyone he didn’t like (which was… most people). He even required nobles to kneel when speaking to him. Humble he was not.

But with power came paranoia. Longchamp’s rivals, chiefly Prince John, Richard’s scheming little brother, started circling. By 1191, Longchamp had gone full villain mode, arresting the Archbishop of York and locking him in the Tower. That crossed a line. The nobles rebelled, John swooped in, and Longchamp was chased out of England dressed as a woman trying to sneak onto a boat. (Yes, really.)

For a while, he ruled England like a monarch. But as any medieval advisor knows, the higher you climb, the further you fall.

2. Roger of Salisbury – The Bureaucrat Who Built a Kingdom

Roger of Salisbury started out as a humble parish priest, chosen by King Henry I because, according to chroniclers, he served mass quickly. But don’t let that fool you. Roger had the cold heart of a strategist and the brain of an accountant with a taste for conquest.

Once in Henry’s inner circle, Roger became Chancellor, then Bishop of Salisbury, and finally Justiciar, running England while Henry focused on staying alive and avoiding rebellions. Roger didn’t fight with swords. He fought with ink, parchment, and a ruthless new thing called “administration.” He built the first real bureaucracy in England, complete with Exchequer, sheriffs, and shiny new tax systems. If you’ve ever hated paperwork, blame Roger.

Royal justice became a machine. And Henry’s control over the country became tighter than a miser’s purse strings. When the king died, Roger tried to play kingmaker—siding with Henry’s daughter, the Empress Matilda, over her cousin Stephen.

Big mistake.

Stephen, never one to let a grudge go to waste, arrested Roger and his nephews and seized their castles. Roger died not long after, but his legacy remained: he’d turned a kingdom into a ledger and proved that sometimes, numbers trump swords.

3. Alvaro de Luna – The Puppetmaster of Castile

If medieval Spain had a drama series, Álvaro de Luna would’ve been the slick, silver-tongued character you’d root for and want to see fall. Born a minor noble in the late 14th century, he caught the eye of young Prince John of Castile. By the time John became King John II, Álvaro had wormed his way into the royal ear.

De Luna was charming, clever, and utterly ruthless. He knew how to play court politics like a chessboard, moving bishops, nobles, and even the king himself into place. While John II loved poetry and falconry, De Luna loved power. He kept John sheltered, distracted, and dependent, essentially running Castile behind the scenes while making sure the king stayed just the right amount of helpless.

He became Constable of Castile and Grand Master of the Order of Santiago, giving him military muscle to go with his political game. And when rival nobles tried to oust him, De Luna didn’t blink. He crushed rebellions, silenced critics, and always came back stronger. For over two decades, he pulled every string in the kingdom.

But even master puppeteers can lose the plot. When John’s new queen, Isabella of Portugal, entered the picture, she wasn’t impressed. De Luna was accused of mismanaging funds and overreaching his power, neither of which was new, but now the king was listening. In 1453, John signed his old friend’s death warrant. De Luna was executed by beheading, still insisting the king loved him.

He wasn’t wrong. John reportedly mourned him for the rest of his life. But in the end, even puppets can cut their strings.

4. The Marmousets – The Clerks Who Ran a Kingdom

Known collectively (and a bit mockingly) as the Marmousets, these royal advisors served King Charles V in the late 14th century, and for a while, they made France function like a well-oiled machine.

The nickname “Marmousets” roughly translates to “little monkeys,” meant to mock their low-born status and overly intellectual airs. But these were sharp, educated bureaucrats who knew how to fix a broken kingdom. Men like Bureau de La Rivière, Jean de Montaigu, and Jean Le Mercier were unstoppable.

They tackled France’s economic chaos, restored royal authority, and most impressively kept things running during the Hundred Years’ War. Charles let them do what they did best: think, write, calculate, and outmaneuver the aristocracy. The Marmousets modernized the state, cleaned up corruption, and built systems the monarchy would rely on for years.

However, the gloves came off when Charles V died and his son Charles VI took over. The old guard, highborn nobles who hated being bossed around by “clever commoners,” got their revenge. The Marmousets were accused of overreach, treason, and being altogether too effective. Most were exiled, some executed, and the rest erased from power.

5. Hildegard of Bingen – The Mystic Who Spoke to Emperors

Hildegard wasn’t your typical medieval power broker. Born in 1098 and packed off to a convent as a child, she became one of the most formidable figures of the 12th century. She was an abbess, composer, healer, and theologian, but above all, she was a woman men couldn’t ignore.

From an early age, Hildegard claimed to experience divine visions. Unlike most medieval mystics, she didn’t keep quiet about them. She wrote them down in stunning detail, backed them up with theology, and sent copies directly to the people in power. When Hildegard told off Frederick Barbarossa for meddling in church affairs, he took the hint. When monks tried to silence her, she thundered back with letters that would make a bishop sweat.

She advised kings and nobles on politics, penned treatises on medicine and the natural world, and even founded her own convent. Her works were copied, studied, and feared. She knew her worth and wasn’t shy about saying that her visions came straight from God.

In an era when women were meant to stay quiet and obedient, Hildegard stood up, spoke out, and built a legacy that outlasted half the monarchs she counseled.

6. Jean Le Mercier – Treasurer, Kingmaker, and Scapegoat

Jean Le Mercier started life with little more than a pen and a head for numbers, and somehow shaped France’s fate. Born a commoner in the 1330s, he climbed the greasy pole of royal service by managing money better than anyone else. Under Charles V, he became treasurer, counselor, and part of the Marmousets. 

As treasurer, he oversaw vast state finances during a messy stretch of the Hundred Years’ War. His reforms helped bring in cash, restore order, and keep the French crown afloat. And as Charles V’s trust in him grew, so did Jean’s real power. He was steering policy, controlling court appointments, and deciding who could access the king.

But brains and boldness made enemies fast. When Charles VI took the throne, the old aristocracy launched a revenge campaign against the Marmousets. Le Mercier, by now fabulously wealthy and highly resented, became the perfect scapegoat. He was accused of corruption, stripped of his titles, and exiled. His fortune was seized. His reputation was shredded.

7. The Witan – A Council That Could Make or Break Kings

Long before Parliament and long before Magna Carta, England had the Witan. Short for Witenagemot, which sounds like a wizard convention but was actually a council of nobles, bishops, and top-ranking advisors. It could make you king. Or unmake you, if you annoyed them enough.

Meeting whenever and wherever the king called, the Witan handled everything from passing laws to choosing successors. Unlike the yes-men of later royal courts, the Witan had clout. They picked kings like Edward the Confessor. They also had no The Witan’s approval gave a ruler legitimacy. Monarchs had to negotiate, flatter, and sometimes grovel. Even powerful kings like Alfred the Great had to work with them, not around them.

Of course, once the Normans arrived, the Witan’s days were numbered. William the Conqueror preferred swords to suggestions. But while it lasted, the Witan showed that even in the early Middle Ages, the crown didn’t always call the shots. Sometimes, it had to ask permission first.

8. The Ricohombres – Noble Advisors with Swords and Sass

In medieval Castile, kings didn’t rule alone; they were constantly flanked by the ricohombres, a hand-picked circle of powerful nobles whose name means “rich men.” And rich they were. These weren’t your average titled aristocrats sitting pretty on inherited land. The ricohombres had wealth and armies and ensured the king never forgot who really had the muscle.

Unlike the more bookish advisors of other courts, the ricohombres brought a different vibe to royal counsel, more battlefield than balance sheet. They acted as military leaders, political advisors, and royal babysitters all rolled into one. Kings needed them to crush rebellions, lead campaigns, and look threatening in court meetings. But they also needed to watch their backs. Ricohombres had a habit of flipping loyalties or demanding more power if they felt underappreciated.

Throughout the 13th and 14th centuries, these swaggering nobles steered royal decisions, manipulated succession crises, and occasionally ran the kingdom when the monarch was too young, weak, or dead. If a king wanted to stay on the throne, he had to keep the ricohombres onside.

Of course, this kind of “advice” often came with strings attached. In Castile, ruling with the ricohombres was a delicate dance. Ruling without them? Suicidal.

9. Christine de Pizan – The Feminist Firebrand of the French Court

Christine de Pizan was born in Venice in 1364 and raised in France, she grew up surrounded by books and big ideas, thanks to her father, a court astrologer to Charles V. When her husband died young, leaving her with three children and no financial support, Christine did something practically unheard of: she became a professional writer.

She was bold, brilliant, and completely unafraid to call out the nonsense of her time. She wrote poetry, political theory, and biting critiques of misogynist texts that were wildly popular in court circles. She built a whole symbolic city filled with powerful women from history and legend, challenging the idea that women were weak, foolish, or immoral by nature.

Her patrons included dukes, queens, and even the French royal family. She corresponded with kings and advisers, offered political counsel, and called for unity during the bloody Armagnac–Burgundian civil war. And when Joan of Arc rode onto the scene, Christine was the first to recognize her as a national heroine, writing a celebratory poem while others still doubted.

Christine didn’t hold a formal title or command an army. But her words shaped court debates, shifted perceptions, and gave medieval France one of its fiercest intellectual voices. 

10. The Medici – Florence’s Godfathers of Power

If medieval politics were a chessboard, the Medici were calling checkmate. Starting as bankers in 14th-century Florence, the Medici family quietly transformed financial clout into political dominance without ever technically sitting on a throne. Who needs a crown when you’ve got the pope in your pocket and half of Europe in your debt?

The real rise began with Cosimo de’ Medici, who turned the family bank into one of Europe’s most powerful financial institutions. He paid off allies, sponsored artists, and positioned himself as the man behind every major decision in Florence. Officially, he was just a citizen. In reality, he was calling the shots.

His grandson, Lorenzo “the Magnificent,” took it even further. Charming, ruthless, and a master of the slow-burn takeover, he made Florence a hub of Renaissance art, philosophy, and political maneuvering. He advised kings, negotiated with popes, and kept enemies close.

Despite assassination attempts, exiles, and the occasional downfall, the Medici always seemed to bounce back, usually with even more power. Several family members became popes. Others married into royalty. And yes, they finally took a throne or two for themselves.

But in their golden years, the Medici were the ultimate shadow rulers. With velvet gloves and iron wills, they proved that money talks, and occasionally arranges a quiet little poisoning in medieval politics.

So, Who Wore the Crown?

The Middle Ages loved their pageantry, but true power often lay behind the throne. Advisors like these shaped empires, orchestrated wars, and outlasted kings. They remind us that history isn’t always made by the one holding the scepter, but often by the one whispering in his ear.