The Esrohs

The Esrohs are NOT normal horses. They are beautiful purple-black horses with red manes. If you look closely, you'll see that 'Esroh' is 'horse' spelt backwards.

There are a total of 12 Esrohs on Horse Isle:

Aphrodite (Birch Isle, requirement: Give him 1 million)

Apollo (Bud Isle, requirement: An underwater helmet and a gramophone)

Ares (Triangle Mountain, requirement: 250 entries in any arena event)

Athena (Drip Isle, requirement: Artisan (level 4 constructing) and Quilter (level 4 sewing))

Artemis (Lost Jungle Isle, requirement: BB award (5k person exp, 1k horse exp)

Demeter (Droplet Isle, requirement: Sous Chef Level (Level 4 cooking))

Dionysus (Golden Isle, requirement: 75% of minigames completed)

Hephaestus (Harbor Isle, requirement: An underwater helmet and 250 of all the ores)

Hera (Flurry Isle, requirement: Answer all the riddle posts in the game)
Note: To get to Flurry Isle, talk to the penguin at the southeast corner of White Isle, and pay him $1,000

Herms (Gas Isle, requirement: 75% of quests completed)
Poseidon (Lost Reef, requirement: An underwater helmet and a set of 4* tack)

Zeus (Center Isle, requirement: All other Esrohs completed)
Note: To get to Center Isle, finish Hera, and then talk to the man on Shipwreck Isle and give him 20 doubloons.

I hope you find this information useful!