Analysis of information sources in references of the Wikipedia article "เส้นทางนักบุญยากอบ" in Thai language version.
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(help). This entry on indulgences suggests that the evolution of the doctrine came to include pilgrimage to shrines as a trend that developed from the eighth century A.D.:
“ | Among other forms of commutation were pilgrimages to well-known shrines such as that at St. Albans in England or at Compostela in Spain. But the most important place of pilgrimage was Rome. According to Bede (674-735) the "visitatio liminum", or visit to the tomb of the Apostles, was even then regarded as a good work of great efficacy (Hist. Eccl., IV, 23). At first the pilgrims came simply to venerate the relics of the Apostles and martyrs; but in course of time their chief purpose was to gain the indulgences granted by the pope and attached especially to the Stations. | ” |