a crusade

Peregrinatio Etheriae or Peregrinatio Silviae, another pilgrim to the Holy Land's account in a long letter home.

Peregrinatio (sometimes anglicized as Peregrination) is the Latin word for pilgrimage. It also specifically refers to:

the Peregrinatio Sancti Petri, a papal institution for assistance to pilgrims to Rome and certain other pious sites and events

Peregrinatio Scholastica, or Learning's Pilgrimage, a collection of 22 morall Tractes written by the English dramatist John Day.