http://fireemblem.wikia.com/wiki/Yarne

As the son of Panne and her human husband, Yarne was born in the future as the first human-taguel hybrid. This made him a clear sign that the Taguel would survive. Unfortunately, he lost both parents at a young age. His father's death was particularly painful: he promised to Yarne that he'd return from battle, but died in the battle right after this conversation, breaking that promise. With the death of his mother Panne, Yarne became the new "Last Taguel" in the world. Though Yarne has immense pride of his Taguel heritage, he also feels like he's burdened by his "Last Taguel" status. Unlike the other children, Yarne does not mention having Panne's wedding ring, but is assumed to have followed suit. Seeing the opportunity as a means of self-preservation, Yarne joins Lucina and the other children to travel back to the past to prevent the ruinous future. Upon arriving in the past, separated from his friends, Yarne searched for strong allies to protect him and eventually stumbles upon the Stonewall Knights, whom he stays with until the revelation with Lucina at Carrion Isle.