 The second phase of building work undertaken by the Hospitallers began in the early 13th century and lasted decades . The outer walls were built in the last major construction on the site , lending the Krak des Chevaliers its current appearance . Standing 9 metres ( 30 ft ) high , the outer circuit had towers that projected strongly from the wall . While the towers of the inner court had a square plan and did not project far beyond the wall , the towers of the 13th @-@ century outer walls were rounded . This design was new and even contemporary Templar castles did not have rounded towers . The technique was developed at Château Gaillard in France by Richard the Lionheart between 1196 and 1198 . The extension to the southeast is of lesser quality than the rest of the circuit and was built at an unknown date . Probably around the 1250s a postern was added to the north wall . 
 The second phase of building work undertaken by the Hospitallers began in the early 13th century and lasted decades . The outer walls <a href='uninflect' title='1'><mark>were</mark></a> built in the last major construction on the site , lending the Krak des Chevaliers its current appearance . Standing 9 metres ( 30 ft ) high , the outer circuit had towers <a href='null_relcl' title='2'><mark>that</mark></a>projected strongly from the wall . While the towers of the inner court had a square plan and did not project far beyond <a href='None' title='3'><mark>the</mark></a><a href='negative_concord' title='4'><mark>wall</mark></a> , the towers of the 13th @-@ century outer walls <a href='uninflect' title='5'><mark>were</mark></a> rounded . This design was new and even contemporary Templar castles did not have rounded towers . The technique was developed at Château Gaillard in France by Richard the Lionheart between 1196 and 1198 . The extension to the southeast is of lesser quality than the rest of the circuit and was built at an unknown date . Probably around the 1250s a postern was added to the north wall . 
The second phase of building wrk undertaken by da Hospitallers began in the early 13th century and lasted decades . The outer walls was built in the last major construction on the site , lending the Krak des Chevaliers its current appearance . Standing 9 metres ( 30 ft ) high , the outer circuit had towers projected strongly from tdawall . While thdaowers of thedaner court had a square plan and did not project far beyond no wall , the daers of the 1da @-@ century outer walls was rounded . dis design was new and even contemporary Templar castles did not have rounded towers . The tedaique was developed at Château Gaillard in France by Richard the Lionheart between 1196 and 1198 . The extension to the soudaast is of lesser quality than the rest of the circda and was built at an unknown date . Probably around the 1250s a postern was added to the north wall .