I'm pretty sure ^"King Atrhur" will work
See this Quote
Added ^USERNAME notification for posting. When used, it will send the user a notification they've been mentioned/quoted in that topic. If a username has any characters besides alphanumeric, you must quote it like so: ^"USER NAME" (Sep 26 2019)
Using ^USERNAME now shows as "mentioned" instead of "quoted" to the user being notified. (Sep 27 2019)
Supported characters without having to quote a user in a ^ mention are: a-z A-Z 0-9 _ - ~ Everything else must be quoted, including spaces or periods. (Sep 27 2019)
This post was edited by R0cktaze on Jan 16 2020 02:53pm