LONDON.- Guercino’s King David (1651) has come to the National Gallery to join Guercino’’s The Cumaean Sibyl with a Putto (1651) on display from November 5 2010 until November 21 2010. This is the first time the pair have been seen together since they left Guercino’’s studio more than 300 years ago. ‘King David’ belongs to a private collection and is normally displayed at Spencer House. Both paintings will be on show in Room 32 of the National Gallery in celebration of Sir Denis Mahon’’s 100th birthday. ‘The Cumaean Sibyl with a Putto’ is one of Guercino’’s finest late works – imposing in composition, rich in colour and dignified in pose and gesture. It represents one of the 12 pagan sibyls, or seers, who were reputed to have foretold the coming of Christ. The Cumaean Sibyl predicted that Christ would be born of a virgin in a stable at Bethlehem. The painting was commissioned in 1651 by Gioseffo