Definition of "palmer"

The Pilgrim had some home or dwelling place, the Palmer had none. The Pilgrim travelled to some certain, designed place or places, but the Palmer to all. The Pilgrim went as his own charge, but the Palmer professed wilful poverty and went upon alms.

1674, Thomas Staveley, The Romish horseleech : or, an impartial account of the intolerable charge of Popery to this nation, page 93

Fair Isabel, poor simple Isabel! / Lorenzo, a young palmer in Love's eye! / They could not in the self-same mansion dwell / Without some stir of heart, some malady; [...]

1820, John Keats, “Isabella; or, The Pot of Basil. A Story from Boccaccio.”, in Lamia, Isabella, the Eve of St. Agnes, and Other Poems, London: […] [Thomas Davison] for Taylor and Hessey, […], stanza I, page 49