Jacob Claesz van Utrecht, also named by his signature Jacobus Traiectensis (c. 1479 – after 1525) was a Flemish early Renaissance painter who worked in Antwerp and Lübeck.
Few details are known of Jacob van Utrecht's life.
It is assumed that he became a citizen of Antwerp around 1500 and he is recorded as a "free master craftsman" of the Guild of St Luke there from 1506 to 1512.
[1][2] From 1519 to 1525 he is recorded as a member of the Leonardsbruderschaft ("Leonard's Brotherhood"), a religious confraternity of merchants in Lübeck among whose ranks the leaders of the Protestant Reformation in the 1530s could be found.
[2] In addition to Jacobus Traiectensis he also signed his artworks with his real surname Claesz / Claez.