Today's crossword was a learning experience. We discovered that paeon is a real word and not an error. Indri is a lemur in Madagascar and the River Erne is in Ireland. Previously, I had thought that an Erne was a sea eagle, which it is, but knew of no other Erne.
Just incidentally, we knew that the Feast of Esther is Purim but were not sure it fell in the month of Adar. Now we know.
And just so no one has to look it up, paeon is a metrical foot composed of four syllables: one long and three short. Only one of them is stressed.
But, you knew that . . .