If he were overtaken, or if a braid of his hair were disturbed, or if a dry stick cracked under his foot, he was not accepted.

He must be able to leap over a lath level with his brow and to run at full speed under level with his knee, and he must be able while running to draw out a thorn from his foot and never slacken speed.

He must take no dowry with a wife.
It was said that one of the Fians, namely Keelta, lived on to a great age, and saw St Patrick, by whom he was baptized into the faith of the Christ, and to whom he told many tales of Finn and his men, which Patrick's scribe wrote down.

And once Patrick asked him how it was that the Fianna became so mighty and so glorious that all Ireland sang of their deeds, as Ireland has done ever since.

Keelta answered, "Truth was in our hearts and strength in our arms, and what we said, that we fulfilled." This was also told of Keelta after he had seen St Patrick and received the Faith.