Royllo is a legendary island that was once thought to be located in the Atlantic Ocean

Atlantic Ocean

The Atlantic Ocean is the second-largest of the world's oceanic divisions. With a total area of about , it covers approximately 20% of the Earth's surface and about 26% of its water surface area...

. Probably identical with the island originally called Ymana in the 1424 Pizzigano Map

Pizzigano Map

The Pizzigano Map is a portolan chart dated to 1424 and attributed to the 15th C. Venetian cartographer Zuane Pizzigano...

. The island is usually depicted in many 15th C. maps as a small island located slightly to the west (20 leagues or so) of the much larger Antillia

Antillia

Antillia is a legendary island that was reputed, during the 15th century age of exploration, to lie in the Atlantic Ocean, far to the west of Portugal and Spain...

island. It is often found in the group insulae de novo repertae, or "newly discovered islands" along with other legendary islands.