This is just an FYI for something I found out the other day.
Tang (唐) obviously being the original kanji used for karate (唐手).
"Chang'an (長安) meaning "Perpetual Peace" in Classical Chinese."
https://en.wikipedia.org/wiki/Chang'an
Others have made that connection before: http://iainabernethy.co.uk/content/master-itosu
Thanks for sharing. I also drew attention to the possible connection when discussing the history and purpose of the Pinan / Heian kata in Volume One of the Pinan Flow System.
All the best
John Titchen