Other miniaturists of this period include Alexander Cooper (died 1660), who painted a series of portraits of the children of the king and queen of Bohemia; David des Granges (1611–1675); Richard Gibson (1615–1690); and Charles Beale the Elder and Mary Beale. They are followed by such artists as Gervase Spencer (died 1763), Bernard Lens III, Nathaniel Hone and Jeremiah Meyer, the latter two notable in connection with the foundation of the Royal Academy. The workers in black lead ("plumbago", as it was called at that time) must not be overlooked, especially David Loggan, William Faithorne and John Faber Senior. They drew with exquisite detail and great effect on paper or vellum.