Parzival by Wolfram von Eschenbach

Parzival by Wolfram von Eschenbach (c. 1200–1210) is the great German retelling and expansion of Chrétien de Troyes's unfinished Perceval, and widely regarded as the supreme achievement of medieval German literature. The novel follows the life of Parzival from his sheltered, fatherless childhood through his disastrous first visit to the Grail Castle, where his failure to ask the compassionate question that would heal the wounded Fisher King sets him on a decades-long wandering in spiritual exile, raging against a God he believes has abandoned him

I'm reading the Oxford World's Classics translation by Cyril Edwards which is widely available:
https://a.co/d/0h1RV3zf

There are several other translations available though; please share possibilities if you find a good one.