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Otto I (Hungarian: I. Õdön, Czech: Ota I.; 15 May 1110 – 23 January 1162) was King of Hungary and King of Bohemia from 1131 until his death in early 1162. He was the third king of the Premyslid dynasty to rule Hungary, and also ruled the dynasty's ancestral Czech lands as King of Bohemia. He became King of Hungary and Bohemia in early 1131 following the death of his father, King Zdirad of Hungary. In Hungary, Edmund helped to solidify his family's grip over the Hungarian nobility and was the first Premyslid king to be fully Magyarised culturally. This made him well-liked by the Hungarian nobility and by the end of his reign, he was successfully able to increase royal authority over the Hungarians. Despite this, upon his death and the accession of his son Maurice I (Hungarian: Móric I) to the Hungarian throne, the vast majority of power in Hungary had been returned to the nobility. He was married first to Flavia of Croatia, daughter of King Dmitar of Croatia until her death in around 1140, and then to Ute of Austria, daughter of Ernst the Holy, Holy Roman Emperor.

Early life
The ancestry of Otto I is unclear and because of this it is often disputed. While most chronicles of the time say he was born to Dobroslava, a daughter of the Count of Domazlice, some others question his legitimacy and maintain that he was born to a lowborn Czech woman. However, we know that he was born in May of 1110 in the Premyslid royal palace in Prague, and was the son of Zdirad of Hungary and Bohemia. He grew up in the royal palace, and was educated in the Hungarian culture. Because of this, he was able to easily relate with the Hungarian nobility, which had resented the Czech nobility that was ruling from Prague. After his father's death in 1120, he was ostensibly promised the Hungarian throne by his father, but in reality his cousin Otto, who was descended from the Norwegian branch of the dynasty, succeeded him, in accordance to traditional Czech succession. Despite this, the majority of Hungarian nobles preferred him over Otto, and after around 11 years of conflict in Hungary and Bohemia (known as War of the Two Ottos), he was finally crowned in February of 1132 as Otto I of Hungary.

Reign
The majority of Otto's reign was marked by a time of prosperity and peacefulness. His popularity with the nobility of Hungary enabled him to consolidate royal authority in ways that hadn't been seen ever since before the conquest of Hungary by his father. He was able come to terms family's rival Arpads who ruled over much of Central Hungary, and were the Kings of Hungary before the conquest of Hungary by Bohemia in the early 1100s.

Death
Otto I died sometime in 1162, with his realms being split according to traditional Czech law; The Kingdom of Bohemia went to Vadek I of Norway, who was a member of the Norwegian branch of the Premyslid dynasty, while Hungary went to his son, Maurice, who was crowned as Maurice I of Hungary. His legacy around Hungary would be short-lived, as Maurice ascended at a very young age and was unable to project royal power over the Hungarian nobles. Because of this, power would shift back toward the nobles for several decades.