County Offaly Ireland · Co. Offaly · Geashill Save · Share
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GEASHILL
CO. OFFALY · IE

Geashill
Géisill

STOP 01 / 01
Géisill · Co. Offaly

A village centred on the ruins of Geashill Castle, seat of the O"Dempsey lords.

Geashill is a small village in central Offaly, positioned between Tullamore and Portarlington, near the Grand Canal corridor. The village is defined by the presence of Geashill Castle — ruins of a fortress that belonged to the O"Dempsey clan (Clann Mhaonaigh), who were lords of Offaly in the medieval period.

The castle has been in ruins for centuries. In the 18th century it was briefly held by Lady Mary Dobbins, who reportedly planted an avenue of trees there — a gesture of care that outlasted the structure itself. The village today is quiet, rural, and largely unadorned; the castle remains are the one historical anchor that gives it shape.

Population
300–600
01 / 01

Stories & lore.

The reason to come back. The things every local will eventually tell you about, usually after the second pint.

The O"Dempsey stronghold

Geashill Castle

The castle was the seat of the O"Dempsey clan (Clann Mhaonaigh), lords of medieval Offaly. It fell into ruin, was briefly occupied by Lady Mary Dobbins in the 18th century, who planted an avenue of trees — a small defiance against decay.