/setsiegename
Set the Siege name
In the game
Usage: /setsiegename <SiegeName>
This command allows you to set a name for your Siege Event.
The Siege (AD) name cannot contain the apostrophe (') or backslash (\\) characters.
The maximum name length is 49 characters.
Note: a name can be set only in building Siege mode.
What it does
Not explained in detail yet.
Wiki