|In 300 AC, Volantis
Oppo was the son of Hop-Bean. Oppo and his sister Penny make their living as entertainers who ride atop a pig and a dog while mock fighting each other. Oppo rides the Pig. During these fights they used the names Groat and Penny after the two smallest coins.
A Storm of Swords
Oppo and Penny were hired by a man known as Oswell to entertain the guests in King's Landing during Joffrey Baratheon's wedding to Margaery Tyrell by riding a pig and a dog while in painted wooden armor. Unknown to the pair this stunt is arranged by Petyr Baelish in order to provoke a quarrel between Tyrion Lannister and Joffrey in order to add further false evidence against the dwarf when he would be accused of Joffrey's murder.
A Dance with Dragons
The Winds of Winter
At the start of the Battle of Slaver's Bay, as they ready themselves, Penny tells Tyrion Oppo thought Cersei Lannister was beautiful when he saw her when they jousted for King Joffrey Baratheon. Tyrion thinks privately to himself that Groat was a stunted little lickspittle with a stupid name.