County Offaly · Wikipedia (en)
It was formerly known as King's County, in honour of Philip II of Spain, who was at the time King of Ireland by jure uxoris.
Supports the identification of #10767 County Offaly, Ireland as the same county under its modern name; relation 'renamed'. The same article's Name section records that no legislation was ever enacted after independence explicitly changing the name from King's County, which is why existedTo is left null here.