This fruit is a cross between a pummelo and a white grapefruit.
In the mid-1700's, grapefruit was called, "Forbidden Fruit."
The West Indies were the point of origin for grapefruit, probably as a cross between the pomelo and an orange. It came to Florida in 1840 where a seedless fruit was found fifty years later and propagated to give us the Marsh Seedless variety.