Battle of Mogyoród: Dukes Géza and Ladislaus defeat their cousin Solomon, King of Hungary, forcing him to flee to Hungary's western borderland.

The Battle of Mogyoród took place on 14 March 1074. It was an internal conflict between Solomon, King of Hungary and his cousins duke Géza and Ladislaus, who were claiming rights to the throne.

Géza I was King of Hungary from 1074 until his death. He was the eldest son of King Béla I. His baptismal name was Magnus. With German assistance, Géza's cousin Solomon acquired the crown when his father died in 1063, forcing Géza to leave Hungary. Géza returned with Polish reinforcements and signed a treaty with Solomon in early 1064. In the treaty, Géza and his brother Ladislaus acknowledged the rule of Solomon, who granted them their father's former duchy, which encompassed one-third of the Kingdom of Hungary.

Ladislaus I, also known as Saint Ladislas, was King of Hungary from 1077 and King of Croatia from 1091. He was the second son of King Béla I of Hungary and Richeza of Poland. After Béla's death in 1063, Ladislaus and his elder brother, Géza, acknowledged their cousin Solomon as the lawful king in exchange for receiving their father's former duchy, which included one-third of the kingdom. They cooperated with Solomon for the next decade. Ladislaus's most popular legend, which narrates his fight with a "Cuman" who abducted a Hungarian girl, is connected to this period. The brothers' relationship with Solomon deteriorated in the early 1070s, and they rebelled against him. Géza was proclaimed king in 1074, but Solomon maintained control of the western regions of his kingdom. During Géza's reign, Ladislaus was his brother's most influential adviser.

Solomon, also Salomon was King of Hungary from 1063. Being the elder son of Andrew I, he was crowned king in his father's lifetime in 1057 or 1058. However, he was forced to flee from Hungary after his uncle, Béla I, dethroned Andrew in 1060. Assisted by German troops, Solomon returned and was again crowned king in 1063. On this occasion he married Judith, sister of Henry IV, Holy Roman Emperor. In the following year he reached an agreement with his cousins, the three sons of Béla I. Géza, Ladislaus and Lampert acknowledged Solomon's rule, but in exchange received one-third of the kingdom as a separate duchy.