Antoon Claeissens (his name is given in many varieties, with his first name rendered as Anton, Anthonie, Anthony, Anthuenis, and his surname as Claes, Claesz, Claeis, Claeiss, Claessens and Claeissins), the son of Pieter Claes the elder, painted historical and allegorical subjects, and portraits. He was a native of Bruges, and there entered the Guild of St. Luke in 1575, and became its dean in 1586, 1590, and 1601. He died in 1613. His works, several of which are in the Hôtel-de-Ville and churches of Bruges, are distinguished by their fine colouring and finish. In the H6tel-de-Ville is a 'Grand Banquet' with many portraits of magistrates of the time, dated 1574.
His son, Pieter Anthonie, was dean of the Guild of St. Luke at Bruges in 1607, and died in 1608.