The video below gives a great brief explanation of the history of Easter.
This video briefly goes over the Germanic pagan roots of the term “Easter.” (The false meme about Ishtar’s connection to Easter made its way around social media again- so, hopefully this clears it up a bit for some.)
Unfortunately, the video fails to explain (in depth) that it was actually during the first ecumenical council when the specific day for the Easter celebration was designated.