Today I wanted to write about Fergus mac Léti, an Irish king of Ulster.
The saga of Fergus mac Léti features the first written account of the Leprechaun, when the Leprechaun fails to kills Fergus mac Léti he keeps them captive, exchanging their freedom for wishes which he uses to be able to breathe underwater.
Sources: https://en.wikipedia.org/wiki/Fergus_mac_L%C3%A9ti?wprov=sfla1
Ganymedes' guide. 