The bridal wreath is a relic of the corona nuptialis used by the Greeks and Romans to indicate triumph.
A relic of the Roman Confarreatio, a mode of marriage practised by the highest class in Rome. It was performed before ten witnesses by the Pontifex Maximus, and the contracting parties mutually partook of a cake made of salt, water, and flour (far ) Only those born in such wedlock were eligible for the high sacred offices.
or Wedding Favours represent the true lover's knot, and symbolise union.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894