Ronan is a human in Arbor bay. He looks like a member of the Shining Blade, as the logo is on his armor. He fought the White Mantle, at the cost of his wife and daughter. He then gave up fighting, and then found a seed that planted a strange tree located in Arbor Bay.
"There was a time that I cursed this world for taking away everything that I had. But living here, I have come to understand that these memories, even those that are painful, are the seeds of our identity. They shape our growth."
According to PC Gamer Magazine, Ronan is the person who "planted the seed" for the Sylvari race.