Okay kiddo, let me tell you about something called "confoederatio cum principibus ecclesiasticis." It's a fancy phrase that means a partnership between a group of rulers and religious leaders.
In the past, there were many kingdoms and religious groups in Europe, and they often didn't get along with each other. So, some rulers and religious leaders decided to work together to protect their interests and make sure they could live peacefully.
They created something called "confoederatio cum principibus ecclesiasticis" to formalize this partnership. This helped them to have better communication and understanding between each other.
They worked together to make sure they could protect their lands, help each other in times of need, and even discuss important issues that affected everyone in their group.
Overall, "confoederatio cum principibus ecclesiasticis" helped to strengthen relationships between rulers and religious leaders, and make Europe a more united and peaceful place to live.