[1][2] Roscam is located 4 km (2.5 mi) east of the Galway city centre, immediately north of Oranmore Bay.

Roscam stands on the site of a very early (5th century) monastery, with legend linking it to Saint Patrick.

The 6th-century Saint Aedus (Aidus) transferred the bones of Brión mac Echach Muigmedóin to Roscam.

[7] The ruined tower once marked the limit of O'Halloran (Ó hAllmhuráin, Clann Fhearghaile) territory.

[citation needed] Roscam is said to have been used as a duelling site in the medieval era; at the time, it was well outside of what was then the city of Galway and was easily accessible by boat.