The court in Guildford heard a coroner, John Derrick, that when he was a scholar at the "Free School at Guildford", fifty years earlier, "he and diverse of his fellows did run and play [on the common land] at cricket and other players".

=====================================================
Is "diverse of" grammatical?
How about "diverse range of"?
Or do you have better expressions?

2 answers

https://simple.wikipedia.org/wiki/Cricket

Since the quoted parts in your passage are direct quotations from another source, you should not be changing any parts of it. If your questions are trying to explain some old expressions in English, then be sure you put those words in square brackets, like this:

The court in Guildford heard a coroner, John Derrick, that when he was a scholar at the "Free School at Guildford", fifty years earlier, "he and [many of his friends] did run and play [on the common land] at cricket and other players".

In 1598, "diverse of" must have meant many of or many different.
I believe the word most often used was "divers." But spelling consistency was not a big deal Back in the Day. I have run across it in old books and the King James bible.