Demetrius I Csák

Demetrius (I) Csák
Seal of Demetrius Csák
Judge royal
Reign	1232–1234 1242–1244
Predecessor	Benedict, son of Samud (1st term) Ladislaus Kán (2nd term)
Successor	Ladislaus Kán (1st term) Stephen Gutkeled (2nd term)
Spouse(s)	unknown
Issue Ugod Csák a daughter
Noble family	gens Csák
Father	Luka
Died	after 1254

Demetrius I from the kindred Csák (Hungarian: Csák nembeli (I) Demeter; died after 1254) was a Hungarian baron, who held secular positions during the reign of kings Andrew II and Béla IV.

Demetrius I belonged to the Ugod branch of Csák clan as the son of Luka. Possibly he had a brother Adam. From his unidentified wife, he had two sons (Ugod and Csák) and a daughter, who married Csépán II Győr, son of Palatine Csépán I Győr.

He was loyal to King Andrew II. He served as Master of the stewards (Latin: senescalcus) for thirteen years between 1217 and 1230. Beside that he was also ispán of Vas County from 1219 to 1222. He participated in the Fifth Crusade under the command of Andrew II between 1217 and 1218. Returning home, he governed Pozsony County from 1224 to 1229. After 1230, he became a supporter of Duke Béla. He was appointed Judge royal in 1232 and held that dignity until 1234. He was also ispán of Bács County during that time, from 1233 to 1234.

From 1238 to 1241, now during the reign of Béla IV, he served as ispán of Csanád County. He was appointed Judge royal for the second time in 1242 and held the office until 1244, however according to non-authentic royal charters he was Judge royal still in 1245 and 1246. During that time, he also functioned as head of Moson County. According to a non-authentic diploma, he served as Judge royal and ispán of Bodrog County in 1246. He died after 1254.