He had an Italian colleague Bartolommeo Penni, brother of the much more distinguished Luca and Gianfrancesco, Raphael's right hand man.
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It is not recorded that he was officially appointed serjeant-painter, though Horace Walpole believed that he was.
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Horace Walpole provided information about some of the tasks de Critz performed in his Anecdotes of Painting in England, which he based closely on the notes of George Vertue, who had met acquaintances of de Critz and his family.
George Romney (painter) | David Park (painter) | Serjeant-at-Arms | Serjeant-at-law | Serjeant at Arms of the British House of Commons | Francis Bacon (painter) | Thomas Hart Benton (painter) | House painter and decorator | William Hart (painter) | Thomas Lawrence (painter) | serjeant-at-law | Robert Reid (painter) | Richard Wilson (painter) | Painter of the Wind | John the Painter | John Russell (painter) | John Mark Painter | Amasis Painter | William Collins (painter) | The Painter of Signs | Kleophon Painter | Kevin Painter | John Martin (painter) | John Hunt Painter | Gerhard Munthe (painter) | Eyre Crowe (painter) | David Roberts (painter) | Charles C. Painter | Andrew Painter | William Rock Painter |
Calthorpe married firstly Winifred Toto, daughter of the Italian-born painter Anthony Toto, Serjeant Painter to Henry VIII and Edward VI.