<div dir="ltr">Look at the "A King In His Castle" section of <a href="https://acoup.blog/2021/12/10/collections-fortification-part-iii-castling/">https://acoup.blog/2021/12/10/collections-fortification-part-iii-castling/</a><div><br></div><div><a href="https://www.exploring-castles.com/castle_designs/">https://www.exploring-castles.com/castle_designs/</a></div><div><br></div><div><a href="https://www.english-heritage.org.uk/castles/castles-through-time/">https://www.english-heritage.org.uk/castles/castles-through-time/</a></div></div>