Who married Euphemia of Hungary?

Euphemia of Hungary was a daughter of King Béla I of Hungary and his wife, Richesa (or Adelaide) of Poland (1050s – 11 April 1111). She was the wife of Duke Otto I of Olomouc, the second son the Duke of Bohemia Bretislav I .

They were married before 1073.

Some researchers believe that Euphemia was the daughter of Bela's older brother Andrew I of Hungary and his wife Anastasia of Kiev, with the alternative name Adelhaid been proposed, due to minimal sources on her birth. Though the theory supported by most scholars and historians is that Euphemia was born as a result of a marriage between King Bela I and an unknown Piast Princess.

Together they have four children:

• Svatopluk, Duke of Bohemia (21 September 1109)
• Otto II the Black (18 February 1126)
• Bretislav
• Boleslava

Their youngest two children disappeared from written records and thus, are assumed to have died at a young age.

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Otto I (1045 – 9 June 1087), known as Otto the Fair (Czech: Ota Sličný), a member of the Přemyslid dynasty, was Prince of Olomouc in Moravia from 1061 until his death.

He was the youngest son of the Bohemian duke Bretislav I and his wife Judith of Schweinfurt. After his father's death in 1055, his older brother was crowned as Duke Spytihněv II of Bohemia. Otto ruled as a Přemyslid prince in Brno, but after struggles with his brother Vratislaus of Olomouc, he took refuge in Prague. When in 1061 Spytihněv died and his brother Vratislaus was crowned duke, Otto took over the government of the Olomouc principality. Like his brothers Conrad and Bishop Jaromír of Prague, he strongly resisted against Duke Vratislaus' centralised rule.

Otto married Euphemia, a daughter of King Béla I of Hungary, before 1073. His sons were:

• Svatopluk, Duke of Bohemia (d. 1109)
• Otto II the Black (d. 1126)

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