In the back of the Frankel printing of the Rambam, they have a section of collected commentaries. One of them is a work titled "Arba'ah Turei Even." The Frankel bio page identifies the author as אלעזר רוקח, av beis din of Brod and Amsterdam, buried in Tzfas. My HebrewBooks search has the work published in 1789.
I am curious who he was, in terms of who his teachers were, what positions he held, and if he had any well-known students. Accounts of how he was regarded by others would also be helpful.
In general, I am trying to get a picture of his significance and authority. These are the factors that I think would be helpful, although any other info to this end would be appreciated.