In 1387 he was one of the Lords Appellant, who endeavored to separate Richard from his favorites. After Richard regained power, Beauchamp retired to his estates, but was charged with high treason in 1397, supposedly as a part of the Earl of Arundel's alleged conspiracy. He was imprisoned in the Tower of London (in what is now known as the "Beauchamp Tower"), pleaded guilty and threw himself on the mercy of the king. He forfeited his estates and titles, and was sentenced to life imprisonment on the Isle of Man. The next year, however, he was moved back to the Tower, until he was released in August 1399 after Henry Bolingbroke's initial victories over King Richard II.