MS M.399, fol. 6v

Occupations of the Month: May―Four figures, including a helmsman, a man playing a pipe, and a woman playing a lute, are in a boat on a lake surrounding a castle. A flask hangs over the edge of the boat. A heron stands on the shore beside the boat, and swans swim on the lake. To the left, horsemen pass a building while riding on a road alongside lake.
The scene is within an illusionistic wood frame.