King John's Castle
County Limerick, Ireland
King John's Castle is a castle in County Limerick, Ireland, first built in 1210. It is a National Monument of Ireland. The nearest other castle is Fanning's Castle, 0.2 mi away. It is owned by John, King of England.

King John's Castle at a glance
Built
1210
13th century
Type
Castle
Cared for by
John, King of England
Heritage status
national monument of Ireland
About King John's Castle
King John's Castle (Irish: Caisleán Luimnigh) also known as Limerick Castle is a 13th-century castle located on King's Island in Limerick, Ireland, next to the River Shannon. Although the site dates back to 922 when the Vikings lived on the Island, the castle itself was built on the orders of King John of England in 1200.
From the Wikipedia article on King John's Castle, CC BY-SA 4.0.
King John's Castle sits at 52.6697, -8.6256 in County Limerick. The closest other castles are Fanning's Castle (0.2 mi), Carrigogunnell (5.2 mi) and Castle Connell (5.9 mi). County Limerick has 16 castles in all.