Da Gama at Calicut and Columbus at Cuba gave the line of demarcation of Alexander VI. a significance that was not felt to be impending, five years earlier, on the 3d and 4th of May, 1493, when the Papal Bull was issued.[154] This had fixed the field of Spanish and Portuguese exploration respectively west and east of a line one hundred leagues[155] west of the Azores, following a meridian at a point where Columbus had supposed the magnetic needle[156] pointed to the north star.[157] The Portuguese thought that political grounds were of more consideration than physical, and were not satisfied with the magnet governing the limitation of their search. They desired a little more sea-room on the Atlantic side, and were not displeased to think that a meridian considerably farther west might give them a share of the new Indies south and north of the Spanish discoveries; so they entered their protest against the partition of the Bull, and the two Powers held a convention at Tordesillas, which resulted, in June, 1494, in the line being moved two hundred and seventy leagues westerly.[158] No one but vaguely suspected the complication yet to arise about this same meridian, now selected, when the voyage of Magellan should bring Spaniard and Portuguese face to face at the Antipodes. This aspect of the controversy will claim attention elsewhere.[159] From this date the absolute position of the line as theoretically determined, was a constant source of dispute, and the occasion of repeated negotiations.[160] [Illustration: Justin Winsor] NOTES. A. FIRST VOYAGE.—As regards the first voyage of Columbus there has come down to us a number of accounts, resolvable into two distinct narratives, as originally proceeding from the hand of Columbus himself,—his Journal, which is in part descriptive and in part log, according to the modern understanding of this last term; and his Letters announcing the success and results of his search. The fortunes and bibliographical history of both these sources need to be told: