Peregrin Took
Although J. R. R. Tolkien's novels predate what could technically be called the "bromance era", the portrayal of the lifelong close relationships between Frodo Baggins and Samwise Gamgee, Meriadoc Brandybuck and Peregrin Took, and Gimli and Legolas in the novels have been characterized as bromance, as well as the depictions in the films based on them.