Flemish family of painters. Pieter Claeissins (i) (b ?Bruges, 1499 or 1500; d ?Bruges, 1576) and his three sons Gillis Claeissins (b Bruges, before 1536; d Bruges, 17 Dec 1605), Pieter Claeissins [Claeissz.] (ii) (b ?Bruges, before 1536; d ?Bruges, 1623) and Anthuenis [Antoon] Claeissins (b Bruges, 1536; d Bruges, 18 Jan 1613) were all active in Bruges, but little of their life and work has been documented. Pieter Claeissins (i) was a pupil of Adrian Becaert in 1516; in 1530 he became a master in the Bruges Guild of St Luke, where he later held various official posts. He was also enrolled (1544) as an illuminator in the craft guild. In 1572 he was commissioned to paint a Resurrection for Bruges Cathedral (in situ). He also executed a number of portraits (e.g. Self-portrait; Oslo, N.G.).