Out of his saddle swythe he start
As sparcle doth out of fyer';
Percy Folio MS. ii. 440.
2106. The first few lines of the romance of Sir Perceval of Galles (ed. Halliwell, p. 1) will at once explain Chaucer's allusion. It begins—
'Lef, lythes to me
Two wordes or thre
Of one that was faire and fre
And felle in his fighte;
His right name was Percyvelle,
He was fostered in the felle,