Lymond Pease is a sellsword in service to the Golden Company. As a serjeant, he is a high-ranking officer.
Lymond, like the rest of the company, swears his allegiance to Aegon Targaryen in Volon Therys before they invade Westeros.
After landing in Westeros and taking of Griffin's Roost, Jon Connington calls for a war council. Lymond is one of the nine men present at this meeting.