I voted for YES - remove it.
The reasons?
I think RL-Flags have nothing to seek in a medieval roleplaying-GAME.
Also, in my holy and professional onion, the banner looks not medi-eval enough.
AND! That clan only uses the banner to offend people and troll them. I offered them to make a flag that would fit better into this game, but they did not react... instead they tried to troll (same as I do all day.
).
Isatis, do me a favour: Change the votes a bit:
"Yes" to "Yes, remove it!"
and "No" to "No, let it stay in!"
That takes away the possibility of a fail-vote.