Former Gimsøy Abbey location?

Hello readers, I'm making a family book about a few of my famous Norwegian ancestors. One of them was buried at Gimsøy Abbey in Skien. The more research I do on this place the more confused I get. I have read that burned down in 1546 and cleared, but I'm still interested in finding is former location. Here are my questions: #1 I read that it was located on a island in Skien? Where is this Island? I assumed this is a confusion with a different Gimsøy...in Nordland County perhaps? #2 I found a Gimsøy kirke in the town of Skien. Is this parish related to the old Abbey? Is it sitting where the old Abby used to be? Pointing in the direction of a reliable source on the topic would be very helpful! Thanks! Heidi