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Connacht Rugby was created in 1885.
There is no island called Connacht. Connacht is a province in Ireland, forming much of the west of Ireland. There are lots of islands off the coastal areas of Connacht, most famously the Aran Islands.
Cú Connacht Ua Dálaigh died in 1139.
Dunadach mac Cú Connacht died in 1032.
Cú Connacht mac Dundach died in 1006.