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That story is recounted by Bede. I might as well quote it.
>This being decreed, there came, it is said, seven bishops of the Britons, and many men of great learning, particularly from their most celebrated monastery, which is called, in the English tongue, Bancornaburg, and over which the Abbot Dinoot is said to have presided at that time. They that were to go to the aforesaid council, be-took themselves first to a certain holy and discreet man, who was wont to lead the life of a hermit among them, to consult with him, whether they ought, at the preaching of Augustine, to forsake their traditions. He answered, "If he is a man of God, follow him."— "How shall we know that?" said they. He replied, "Our Lord saith, Take My yoke upon you, and learn of Me, for I am meek and lowly in heart; if therefore, Augustine is meek and lowly of heart, it is to be believed that he bears the yoke of Christ himself, and offers it to you to bear. But, if he is harsh and proud, it is plain that he is not of God, nor are we to regard his words." They said again, "And how shall we discern even this?" – "Do you contrive," said the anchorite, "that he first arrive with his company at the place where the synod is to be held; and if at your approach he rises tip to you, hear him submissively, being assured that he is the servant of Christ; but if he despises you, and does not rise up to you, whereas you are more in number, let him also be despised by you."
They did as he directed; and it happened, that as they approached, Augustine was sitting on a chair. When they perceived it, they were angry, and charging him with pride, set themselves to contradict all he said. He said to them, "Many things ye do which are contrary to our custom, or rather the custom of the universal Church, and yet, if you will comply with me in these three matters, to wit, to keep Easter at the due time; to fulfil the ministry of Baptism, by which we are born again to God, according to the custom of the holy Roman Apostolic Church; and to join with us in preaching the Word of God to the English nation, we will gladly suffer all the other things you do, though contrary to our customs." They answered that they would do none of those things, nor receive him as their archbishop; for they said among themselves, "if he would not rise up to us now, how much more will he despise us, as of no account, if we begin to be under his subjection?" Then the man of God, Augustine, is said to have threatened them, that if they would not accept peace with their brethren, they should have war from their enemies; and, if they would not preach the way of life to the English nation, they should suffer at their hands the vengeance of death. All which, through the dispensation of the Divine judgement, fell out exactly as he had predicted.
http://www.ccel.org/ccel/bede/history.v.ii.ii.html