An Ohio teen has gone viral for galloping up to his girlfriend’s house with his three best friends for an epic, medieval-themed “promposal.” Gavin Gillig showed up at his girlfriend, Gianna Masterlasco’s, house near Findlay, Ohio on April 25 with three willing comrades: fellow seniors Ethan Bauer, RJ Coldren, and Damon Gasser. The Liberty-Benton High Schoolers…