The source of my inspiration was the Pendragon Cycle, a series of books which recontextualizes the King Arthur legends back into pre-Anglo-Saxon England. Here's where you can buy the whole series (copy/paste the link): https://www.amazon.com/dp/B002BIL9I6/ref=cm_sw_r_cp_apan_glc_i_SYF1APAVP8J7DD5JNHPZ
