From the Book of Ballymote (1390), the Auraicept na n-Éces explaining the ogham script.
Swabian 15th Century. A Sibyl, c. 1470. Pen and black and gray ink with gray wash on laid paper, Woodner Collection, Gift of Andrea Woodner, 2006.11. As published by the National Gallery of Art, Washington. This Swabian headwear is very similar to the "cheesemould hat" mentioned in contemporary literature describing a type of Irish headwear in the 16th-17th centuries.