The Moon Men are a small sellsword company based around the Free Cities, founded and led by Laryos Trevan
The Volantene sellsword Laryos Trevan founded the Moon Men on his own and built the company up over time. He mostly based his work around the Free Cities of Essos, but on several occasions sought work in Slaver's Bay.
The Moon Men faced severe casualties when Volantis was sacked by Varyo Velaryon and his army. They later found work in Meereen, where the nobleman Gezzen mo Zahk wanted sellswords to help root out Dothraki led by Khal Drozho. Cleos Baratheon and Aurane Flowers joined the Moon Men to secure passage out of Volantis, and with them Laryos and his men carried their work out in Meereen.
When the Coup of Meereen began, Laryos and the Moon Men sided with the rebelling slaves and pit fighters. Alongside the Manticore Riders and a group of pit fighters led by Sar'sian, they stormed the Great Pyramid, facing huge losses at the hands of sworn soldiers to the king and Unsullied.
During the attack, Laryos Trevan met his end at the hands of Zhanak of the Red Spear, but the Moon Men were later hired by Cleos Baratheon, who had seized control of the city's wealth and Unsullied. The sellswords' numbers were increased when the remaining Manticore Riders joined their ranks.