Renfrew Castle is a historic site located in Renfrew, Scotland. Originally built in the 12th century, it served as a royal residence and played a significant role in the history of the region. The castle was associated with the Stewart family and was an important stronghold during the medieval period. Today, the remains of Renfrew Castle can be found near the banks of the River Clyde. Although much of the structure has eroded over time, it remains a point of interest for visitors and historians alike, reflecting the rich heritage of Scotland and its feudal past.