Mother's Men
From A Wiki of Ice and Fire
The Mother's Men is a company of fighting men formed in Meereen. Its members are all former slaves known as Freedmen and are loyal to Daenerys Targaryen. There commander is Marselen, a brother to Missandei. They are likely to be about 2000 men strong and could be trained in the fashion of the Unsullied, with spear and shield.