Keil [Keilhau], Bernhard [Eberhard; Monsù Bernardo] (b Helsingör, 1624; d Rome, 1687). Danish painter, active in Italy.

The son of a German painter working at the court of Christian IV of Denmark, he was apprenticed to the Copenhagen court painter Maarten van Steenwinckel (1595–1646) and as a master continued his training (1642–4) with Rembrandt in Amsterdam.

He then opened his own studio and taught young artists until 1651, when he travelled to Italy. In Venice he obtained commissions for portraits, decorated palaces and was employed by churches and religious orders, executing works such as the Virgin with St Elia for the Carmelites in Venice and the Virgin and St Dominic for the refectory of the monastery of S Bartolomeo in Bergamo. In 1656 he arrived in Rome, where he remained until his death.

During his sojourn in Italy he was converted to Catholicism.