The only people that could constrain a king or great noble were the catholic church, and the pope.
To a large extent, this was done by the pope and the church. The popes could and did excommunicate kings, and when they did it often gave licence for other people to overthrow those kings, and certainly meant that the kings' supporters were no longer obliged to help or support them. The kings and great nobles were constrained to a large extent by lesser members of the nobility. For example, the lowest order of nobility at the time of King John of England was the barons. But it was the barons who forced King John to sign the Magna Carta. The common people also were a constraint to some extent. The willingness of the people of London to support one monarch or another was particularly important. They were possibly decisive in the war between Steven and Matilda over the monarchy.
Voltaire.
Kings and Popes... I believe. (:
Increased their land holdings gradually over a period of years.:):)
Because they feared that the revolution would carry over to their countries.
the church
Pope and church to some extent, but in the late middle ages the kings often fought the Pope and ignored him.
In some cases the powers of kings and great nobles were constrained by the pope and the church. King John had an interdiction against him. It did not lead to the Magna Carta, but did lead to the king acknowledging obedience to the church. In other cases, the powers of greater nobility were constrained by groups of lesser nobility. This was what brought about the Magna Carta. There were a few cases where ordinary common citizens had a powerful role in determining things. The citizens of London importantly threw their support to King Steven over Queen Matilda in the civil war between them. They did this largely because they simply did not like the queen, who treated them with disdain.
To a large extent, this was done by the pope and the church. The popes could and did excommunicate kings, and when they did it often gave licence for other people to overthrow those kings, and certainly meant that the kings' supporters were no longer obliged to help or support them. The kings and great nobles were constrained to a large extent by lesser members of the nobility. For example, the lowest order of nobility at the time of King John of England was the barons. But it was the barons who forced King John to sign the Magna Carta. The common people also were a constraint to some extent. The willingness of the people of London to support one monarch or another was particularly important. They were possibly decisive in the war between Steven and Matilda over the monarchy.
They help the kings...
Kings got nobles to support them by giving or promising something, usually land.
No. Nobles were kings so that makes your question false.
the king or nobles and knights and the servants plus family of the nobles and kings
the king or nobles and knights and the servants plus family of the nobles and kings
The Kings, The Nobles, and The Peasants.
Often land
Nobles