Weesop is presumed to have been of Flemish origin. George Vertue in his notebooks (I, p. 49) records that: '[he] came here in the time of Vandyke. 1641. liv'd here till 1649. then went away. but said he woud never stay in a Country. where they had cut of the Kings head in the face of all the world & was not asham'd of the Action'. Vertue also recorded that 'many pictures painted by him pass for Vandycke'.
The fine scalloped frame, displaying the Nature deity's dolphin-masks and shells, derives from engravings by Johannes Lutma, and was adopted for Lely's Capel family portraits at Cassiobury, Essex, as well as for his portrait of Arthur Capel, 1st Earl of Essex (d. 1683), now in the National Portrait Gallery (see J. Simon, The Art of the Picture Frame, London, 1996, no. 15).