HMS Berkeley Castle (K387) HMS Berkeley Castle (K387) HMS "Berkeley Castle" was a Castle-class corvette of the United Kingdom's Royal Navy. She was named after Berkeley Castle in Gloucestershire. The Castle-class corvettes were an improved and enlarged derivative of the earlier Flower-class corvettes, which was intended to be built by shipyards that could not build the larger and more capable frigates. The greater length of the Castles gave made them better seaboats than the Flowers, which were not originally designed for ocean escort work. Large numbers (96 in total) were ordered in late 1942 and early 1943 from shipyards in the United Kingdom and
Berkeley Castle received a royal charter from King Henry II giving him permission to rebuild the castle. Fitzharding built the circular shell keep during 1153–56, probably on the site of the former motte. The building of the curtain wall followed, probably during 1160–90 by Robert and then by his son Maurice. Much of the rest of the castle is 14th century and was built for Thomas de Berkeley, 3rd Baron Berkeley: Thorpe's Tower, to the north of the keep, the inner gatehouse to its southwest, and other buildings of the inner bailey. The castle was ransacked in 1326 by the forces of