Italy is being a pain. Created a crusade with target of
Constantinople. However it has immediately gone in opposite direction, hoovering my troops from Burgundy, Provence etc. I don't want war with Italy
at moment and could juggle troops around to minimise impact but...

Attacking the Turks WOULD suit me fine and I am far better placed than
Italy to take out Constantinople. If I raise catholic flag over the crusade target, what happens to Italy's crusade which in now deep in my area?