Ulrich von Dornum

Ulrich von Dornum (1465/66 - 12 March 1536) was a son of the East Frisian chieftain Sibet Attena and his second wife Margarete von Westerwolde.

Through his marriage to Essa von Oldersum in 1494, Ulrich von Dornum became lord of half of the Lordship of Oldersum, as well as of Jarßum and Widdelswehr.

In June 1526, Ulrich von Dornum initiated and organized the so-called Colloquy of Oldersum in the Oldersum Church. The transcript of the Oldersum Colloquy, which he wrote, was printed by Nikolaus Schirlentz in Wittenberg that same year. By distributing this document, Ulrich von Dornum made a decisive contribution to the widespread spread and rapid implementation of the Reformation in East Frisia.