Ulrich I of East Frisia

Ulrich I
Counts of East Frisia
Ulrich I, count of East Frisia
Reign	1464–1466
Predecessor	new creation
Successor	Enno I
Born	1408 Norden, Lower Saxony, Germany
Died	25 or 26 september, 1466 Emden, East Frisia, Germany
Spouse	Theda Ukena
House	Cirksena
Father	Enno Edzardisna
Mother	Gela of Manslagt

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

His father Enno had inherited Norden's Attena, and had become headling of Norden, leaving Ulrich a large inheritance. Ulrich also received the inheritance of the respected family Cirksena through his mother Gela, daughter of Affo Beninga, headling of Pilsum and Manslagt, and Tiadeka Siartze of Berum. Gela and her cousin Frauwa Cirksena ("Sydzena") were the only heirs of the Cirksenas of Berum. Ulrich's father Enno had used the opportunity to arrange a marriage between his son from his first marriage, Ulrich's stepbrother Edzard, and Frauwe. Ulrich and Edzard took their wives' family name and arms. When Edzard and Frauwa died childless in 1441 from the plague, Ulrich inherited the holdings of the Cirksenas of Berum as well. In 1430, together with his father and eldest stepbrother Edzard, Ulrich concluded the Freiheitsbund der Sieben Ostfrieslande (Freedom-alliance of the seven East Frisian lands).

This alliance was aimed against the ruling Focko Ukena. Edzard, together with his brother Ulrich, managed to put an end to the rule of the Ukena-faction. Ulrich Cirksena also followed an advantageous marriage strategy. His first wife was Folka, only daughter and heir of headling Wibet van Esens. She transferred the lordship Esens to Ulrich in 1440. After Ulrich Cirksena's marriage to Theda, granddaughter of his opponent, in 1455, the majority of the East Frisian lands was united for the first time. Only the lordships of Jever and Friedeburg remained independent. Sibet Attena, a nephew and ally of Ulrich, received the lordships Esens, Stedesdorf and Wittmund, which together formed the Harlingerland. The Harlingerland did remain under the authority of the Cirksena family.