Who won the main event at the first Wrestlemania?

The first Wrestlemania marked a turning point, not just in the realm of professional wrestling, but for society as a whole.

Ushering in the era of the Rock N' Wrestling Connection in earnest (aka, the crossover of pro wrestling and pop culture), Wrestlemania remains a cultural force to this day. Although, c'mon, the first 10 were the best.

Do you remember who won the very first Wrestlemania event?