The duke's daughter

Rodrigue adopts Byleth and renames her Byleth Rose Fraldarius before she meets her older brother Glenn and their uncle the morning after Rhea leaves her in a basket on his doorstep and knocks on his door before she leaves at night in early November 1159. Nearly 20 and a half years later, in March 1180, Byleth and her younger brother, Felix Hugo Fraldarius, attend the officers academy alongside their friends. 4 years ago, she saved their older brother Glenn and Dimitri's father Lambert from getting murdered by sinister mages and helped Dimitri save Dedue from the mages as well.