Is 417 virgates as big as Inis Mór?
It's about one-and-three-fifths times as big as Inis Mór

The size of Inis Mór is about 260 virgates.
(a.k.a. Inishmore, a.k.a. Árainn Mhór, a.k.a. Inis Bant, a.k.a. Árainn na Naomh) (Connacht, Ireland)
The largest of the Aran Islands, Inis Mór measures 260 virgates. The west side of the island is home to the Poll na bPéist, a.k.a. the wormhole, a naturally-formed, 0.0024 virgates, rectangular pool on the island's cliffside.
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