The other half of the Gromgard Twins, Grenville Gromgard is a vain and cunning man. He naturally gravitates towards the beautiful and poetic Elves, which are very much how he sees himself.
He regards the young Lord as a nuisance and ignores him wherever possible. He thinks his sister Gerda is uncouth and boorish, and doesn't believe she is smart enough to challenge him as heir to the Gromgard throne. But like his sister, Grenville is growing impatient with his father and wants to find a way to take power for himself.
Overlord: Dark Legend
During the events of "Overlord: Dark Legend" He planned to use the elves to seize control of the kingdom of Greenvale, much like his sister Lady Gerda, allied herself with the Dwarves. However, his plans were foiled when Lord Gromgard killed the Elf King Erasmus, making the murder look like it was perpetrated by the dwarves, whilst simultaneously framing the elves for the death of Dwarf King Widget. As a result, Grenville and Gerda seized control of their respective allies and waged war against each other until both, exhausted from the battles, returned home in an attempt to claim their inheritance, only to be captured and subjugated by their younger brother, who set them to work restoring Castle Gromgard to it's former glory.