To braid St. Catharine's tresses. To live a virgin.
“Thou art too fair to be left to braid St. Catharine's tresses”
(Knights of St), 1714. A Russian military order founded by Peter
the Great after his naval victory of Aland, and so named in compliment
to his wife Catharine.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894