Who married Ulrich I, Count of East Frisia?

Ulrich I of East Frisia was the first count of East Frisia, from 1408 in Norden to 25 or 26 September 1466, in Emden. He was a son of the chieftain Enno Edzardisna of Norden and Greetsiel, and Gela of Manslagt.

Theda Ukena (1432 in Oldersum – 16 November 1494 in Greetsiel) was from 1466 to about 1480 regent of the County of East Frisia.