Mateusz Kossior
Mateusz Kossior, also Kosior, Kossiur, Kossyor, Mateusz Koło, (16th century) was a Polish painter and sculptor of the late Renaissance. His dates of birth and death are unknown.

Kossior was born in Koło, then went to Poznań, where in 1575 he appeared before the City Council to complain against the local painter's guild. The City Council hosted a performance by the artist featuring an image of Madonna and Child. In the years 1579-1595 he was a senior member to several painters' guilds, the Department of Crafts, and bookbinders group. He was a well known and respected artist, and his art earned him a small property in the Poznan. At the end he also lived and worked in Kłecko, where the painter did an altarpiece for the church in Kłecko.

Kossior was influenced by Dutch and Italian paintings. Patrons of the artist included the noble family Czarnkowscy.

The artist had four children: Eve (wife of James Goldsmith Poznan Staniewski, then a goldsmith Thomas Pełka), Stanislaus, Barbara and Hedwig. Son Stanislaw Kossior (Kossiorowicz) (d. 1626) was also a painter, and in the years 1610 and 1617 he was a member of the painters' guild in Poznan, and painted the high altar in Szamotuły.