A drawing of a plan of Imola, showing it enclosed by a ring. Four lines cross the plan, forming on the circle eight points of the compass, at which the names of the winds are written in Leonardo's hand, clockwise from one o'clock.
Medium:Pen and ink, with coloured washes, and stylus lines, over black chalk
Support: paper
Provenance: Bequeathed to Francesco Melzi; from whose heirs purchased by Pompeo Leoni, c.1582-90; Thomas Howard, 2nd Earl of Arundel, by 1630; Probably acquired by Charles II; Royal Collection by 1690
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