Costea was a Voivode of Moldavia

Moldavia

Moldavia is a geographic and historical region and former principality in Eastern Europe, corresponding to the territory between the Eastern Carpathians and the Dniester river...

 mentioned in a document from 1407 in line of rulers between Laţcu and Petru. Initially it has been thought that he ruled between 1373 and 1374, as the first ruler of Moldavia from the Muşat family. Also he was believed by some to have been born in Wallachia

Wallachia

Wallachia or Walachia is a historical and geographical region of Romania. It is situated north of the Danube and south of the Southern Carpathians...

, being probably related to Basarab I's ruling family. More recent studies tend to consider him a son of Bogdan I, who never ruled.

He was married to Margareta (Muşata), a Roman Catholic. They had several children: Petru, Roman

Roman I of Moldavia

Roman I was Voivode of Moldavia from December 1391 to March 1394. He was the second son of Costea Muşat, the first ruler from the Muşatin family....

, all of them ruling in succession after Laţcu's death.

In a document from 1392 it is said that his wife, Muşata, built in the city of Siret

Siret

Siret is a town in Romania, Suceava County, one of the oldest towns in, and a former capital of, the former principality of Moldavia. It is located 2 km from the border with Ukraine, being one of the main border passing points in the North of the country, having both a road border post and a...

, the church Saint John the Baptist

John the Baptist

John the Baptist was an itinerant preacher and a major religious figure mentioned in the Canonical gospels. He is described in the Gospel of Luke as a relative of Jesus, who led a movement of baptism at the Jordan River...

, where she was interred.