Inis Uasal, or "Island of the Nobles," was originally known as Church Island and was a significant monastic site. Founded by Saint Fionán (or Finian) around the 6th century, much of the surviving structures date from the 11th to 13th centuries. Fionán became the patron saint of the Iveragh Peninsula, and his feast day is celebrated on March 16th. A 17th-century poem credits him with protecting the area from plague, and several holy wells in the region are dedicated to him.
The island is home to the ruins of a Hiberno-Romanesque church, with its doorway still standing. The site also features cross slabs, one of which is dedicated to a hermit named Anamchada, who died in 1057. A unique carving of a man playing an early fiddle, similar to figures at Santiago de Compostela, adds to the island's historical significance.
At the opposite end of the island is Fionán's Cell, a beehive-shaped structure that dates to a later period. A narrow passageway, recently discovered at the cell’s southern end, aligns with the midwinter sunset, illuminating the interior. This suggests the monks may have incorporated older rituals into their architecture, adding another layer of spiritual meaning to the island.