Boorman’s gorgeous Excalibur included the mythological/sacred kingship aspect wonderfully.
The land fell barren because Arthur was “ broken” and needed to be healed by the Grail.
Even the movie The Fisher King ( love it) touched upon cleverly masked Arthurian mythology
I could even drag in the drawing and quartering and distributing his bits around the countryside of The Wallace as a backfiring bad idea by Longshanks because the heathen peasantry understood the sacred kingship aspects and were inflamed to fight.
And THE WAR LORD, starring Charlton Heston bring in jus primus noctus/droit du seignrur, as well as ancient pagan "sacred" rivers, ponds, and trees.
SPOT ON...re the WALLACE stuff; BRAVA!