Event Cards influence each other?

[Klumpimann]

Hi!

My question is:
If 'Wormtongue' is played on the table and another event card (can't remember a title) is played, which activates Rohan, which card has priority)? The first or the second one played (this questions is meant generally, too?

Marc

[Veldrin]

The Wortongue card clearly states the ways it can be discarded, so a card activating Rohan will not work.

[glow=green,2,300]Veldrin[/glow]