Patron of Spain, where he is known as Santiago Matamoros (St. James Moorslayer). There is a very edifying entry in The Liturgical Year for St. James relevant to this title, an excerpt of which is below:
... And how did he justify his name of son of thunder, since his voice was heard by a mere handful of disciples in a desert of infidelity?
This new name, another special prerogative of the two brothers, was realized by John in his sublime writings... With regard to James, too, then, eternal Wisdom could not have been mistaken. Let it not be thought that the sword of any Herod could frustrate the designs of the most High upon the men of His choice. The life of the saints is never cut short; their death, ever precious, is still more so when in the cause of God it seems to come before the time. It is then that with double reason we may say their works follow them; God Himself being bound in honour, both for His own sake and for theirs, to see that nothing is wanting to their plenitude. As a victim of a holocaust, He hath received them, says the Holy Ghost, and in time there shall be respect had to them. The just shall shine, and shall run to and fro like sparks among the reeds. They shall judge nations, and rule over peoples; and their Lord shall reign for ever. How literally was this divine oracle to be fulfilled with regard to our saint!
Nearly eight centuries, which to the heavenly citizens are but as a day, had passed over that tomb in the north of Spain, where two disciples had secretly laid the apostle's body. During that time the land of his inheritance, which he had so rapidly traversed, had been overrun first by Roman idolaters, then by Arian barbarians, and when the day of hope seemed about to dawn, a deeper night was ushered in by the Crescent. One day lights were seen glimmering over the briars that covered the monument; attention was drawn to the spot, which henceforth went by the name of the field of stars. But what are those sudden shouts coming down from the mountains, and echoing through the valleys? Who is this unknown chief rallying against an immense army the little worn-out troop whose heroic valour could not yesterday save it from defeat? Swift as lightning, and bearing in one hand a white standard with a red cross, he rushes with drawn sword upon the panic-stricken foe, and dyes the feet of his charger in the blood of 70,000 slain. Hail to the chief of the holy war, of which this Liturgical Year has so often made mention! St. James! St. James! Forward, Spain! It is the reappearance of the Galilean fisherman, whom the Man-God once called from the bark where he was mending his nets; of the elder son of thunder, now free to hurl the thunderbolt upon these new Samaritans, who pretend to honour the unity of God by making Christ no more than a prophet. Henceforth James shall be to Christian Spain the firebrand which the prophet saw, devouring all the people round about, to the right hand and to the left, until Jerusalem shall be inhabited again in her own place in Jerusalem.
And when, after six centuries and a half of struggle, his standard bearers, the Catholic kings, had succeeded in driving the infidel hordes beyond the seas, the valiant leader of the Spanish armies laid aside his bright armour, and the slayer of Moors became once more a messenger of the faith. As fisher of men, he entered his bark, and gathering around it the gallant fleets of Christopher Columbus, Vasco de Gama, Albuquerque, he led them over unknown seas to lands that had never yet heard the name of the Lord. For his contribution to the labours of the twelve, James drew ashore his well-filled nets, from west and east and south, from new worlds, renewing Peter's astonishment at the sight of such captures. He, whose apostolate seemed at the time of Herod III to have been crushed in the bud before bearing any fruit, may say with St. Paul: I have no way come short of them that are above measure apostles, for by the grace of God, I have laboured more abundantly than all they.