Olivia

Olivia is a dancer who travels across the continent in a theater troupe. In the past during one of Olivia's performances, a noble man was smitten by her and plotted to kidnap and marry her. However, Basilio stepped in and prevented this and Olivia has been grateful to him ever since. She can have a son named Inigo, provided she does marry. She will also be Lucina's mother if she marries Chrom, or Morgan's mother if she marries Robin.

(Source: Fire Emblem Wiki)