a yellow circle, indicating this line as the governing ruler of the hexagram Six in the fifth place means:

The sovereign I
Gives his daughter in marriage.
And supreme good fortune.

The sovereign I is T'ang the Completer. By his decree the imperial princesses, although higher in rank than their husbands, had to obey them like all other wives. Here too we are shown a truly modest union of high and low that brings happiness and blessings.