Grenn

Grenn is a character in Game of Thrones. He is played by Mark Stanley and debuts in the first season.

Grenn is a fresh young recruit in the Night's Watch, joining around the same time as Jon Snow.

In the books
In the Song of Ice and Fire novels, Grenn is a tall, well-built young man. He is nicknamed the 'Aurochs' because of his relatively large size and slow speed. He befriends Jon Snow, Pypar and Samwell Tarly and is trained alongside them by Ser Alliser Thorne.