By the way, speaking of Yeless, there's a speculation that High King Cleoness from Langrisser 4 is a descendant of Elwin based on two reasons.
First, King Cleoness has a tiara that greatly resembles the Tiara Elwin possesses. Actually they look almost identical to me.
Two, one of Elwin's Light Path(high kill count, zero retreat) ending, it says as following.
After few years, the war emerged that split the "neighboring continent" into a half. And a young wanderer appeared, and sorted out the war just in a couple of days. The man didn't say his name, but it is said that the man wore a silver winged tiara.
Since there is a very high chance the neighboring continent is Yeless, maybe Elwin had some relationships with nobles in that continent? Or when he left a journey with Liana after visiting her, maybe they settled down in Yeless?
Who knows, just a theory.