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In page Kilkenny Castle:

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Kilkenny Castle has been an important site since Richard de Clare, 2nd Earl of Pembroke, commonly known as Strongbow constructed the first castle, probably a wooden structure, in the 12th century. The Anglo-Normans had established a castle in 1173, possibly on the site of an earlier residence of the Mac Giolla Phádraig kings of Osraighe. Kilkenny formed part of the lordship of Leinster, which was granted to Strongbow. Strongbow’s daughter and heiress, Isabel married William Marshall in 1189.[1]