The Dominican Breviary contains the following anthems at 1st Vespers of St James the Greater, Patron of Spain - the lesser for the psalms, and the greater for the Magnificat:
(O blessed James, deserving of praise by the heart and lips of all, O singular and amiable patron, intercede for us with the Lord.)
(O light and beauty of Spain, most holy James, who holdest the first place among the Apostles, first-crowned with martyrdom of them! O singular guard, who didst deserve to behold our Redeemer, while still a mortal, transformed into the Deity! Graciously hear the prayers of thy servants, and intercede for our salvation and that of all peoples.)
Spanish editions of the Roman Breviary also contain the following responsory; I am still hunting for the music thereof:
R. viii. Iste est, qui ante alios Apostolos primus plantavit Ecclesiam sanguine suo: * Cujus corpus in Gallæciam delatum, per totum orbem gloria illustratur. V. O sidus, o decus Hispaniæ, sancte Jacobe Apostole, intercede pro nobis ad Deum, qui te elegit. * Cujus corpus in Gallæciam delatum, per totum orbem gloria illustratur. Gloria Patri. * Cujus corpus in Gallæciam delatum, per totum orbem gloria illustratur.
(This is him, who before the other Apostles first planted the Church with his blood: * Whose body carried to Galicia, through the whole world was made famous in glory. V. O star, O beauty of Spain, Saint James the Apostle, intercede for us with God, who chose thee. * Whose body carried to Galicia, through the whole world was made famous in glory. Glory be to the Father and to the Son and to the Holy Ghost. * Whose body carried to Galicia, through the whole world was made famous in glory.)
As I hope in a few years to walk the Camino to Santiago de Compostela, for the moment I pray to this great Saint for strength and aid, not least invoking him under his more militant and apposite title: Santiago Matamoros, ruega por nosotros.