The strenuousness of this masterful and overbearing man was displayed in his controversy with the Gallican clergy, upon whom he tried to impose the Easter day observed by the Celtic Church in the British Isles. In his letter to the Gallican synod, he points out their errors, and lectures them on their Christian duties, asking pardon at the end for his loquacity and presumption. Years afterwards, entering upon another controversy, he wrote an extraordinary letter to Pope Boniface IV. The superscription is Hibernian: “To the most beautiful head of all the churches of entire Europe, the most sweet pope, the most high president, the most reverent investigator: O marvellous! mirum dictu! nova res! rara avis!--that the lowest to the loftiest, the clown to the polite, the stammerer to the prince of eloquence, the stranger to the son of the house, the last to the first, that the Wood-pigeon (Palumbus) should dare to write to Father Boniface!” Whereupon this Wood-pigeon writes a long letter in which belligerent expostulation alternates with self-debasement. He dubs himself “garrulus, presumptuosus, homunculus vilissimae qualitatis,” who caps his impudence by writing unrequested. He implores pardon for his harsh and too biting speech, while he deplores--to him who sat thereon--the _infamia_ of Peter’s Seat, and shrills to the Pope to watch: “Vigila itaque, quaeso, papa, vigila; et iterum dico: vigila”; and he marvels at the Pope’s lethal sleep. One who thus berated pope and clergy might be censorious of princes. Gontran died. After various dynastic troubles, the Burgundian land came under the rule nominally of young Theuderic, but actually of his imperious grandmother, the famous Brunhilde. In order that no queen-wife’s power should supplant her own, she encouraged her grandson to content himself with mistresses. The youth stood in awe of the stern old figure ruling at Luxeuil, who more than once reproved him for not wedding a lawful queen. It happened one day when Columban was at Brunhilde’s residence that she brought out Theuderic’s various sons for him to bless. “Never shall sceptre be held by this brothel-brood,” said he. Henceforth it was war between these two: Theuderic was the pivot of the storm; the one worked upon his fears, the other played upon his lusts. Brunhilde prevailed. She incited the king to insist that Luxeuil be made open to all, and with his retinue to push his way into the monastery. The saint withstood him fiercely, and prophesied his ruin. The king drew back; the saint followed, heaping reproaches on him, till the young king said with some self-restraint: “You hope to win the crown of martyrdom through me. But I am not a lunatic, to commit such a crime. I have a better plan: since you won’t fall in with the ways of men of the world, you shall go back by the road you came.”