"St. John's Bread, Carob or Locust tree. " (1851) illustration by James Andrews for the book "Chief Plants Named in Scripture" by Robert Tyas

prodigal son (Luke XV) ... "wasted his substance with riotous living ... filled his belly with the husks that the swine did eat ... (Keratia in Greek ... applied to some pods of leguminous plants ...

Ceratonia (Latin), Ceratocarpo (Italian),  the fruits and flat pods of this tree are edible ... the husks when dried have a pleasant taste ... in Southern Spain ... the seeds of beans  of this plant constituted the principal food of the British cavalry horses during the war of 1811 and 1812 ...