The three days after the bridal and their observance in "sword-bed" are noticed below.
A commoner or one of slave-blood could not pretend to wed a high-born lady.

A woman would sometimes require some proof of power or courage at her suitor's hands; thus Gywritha, like the famous lady who weds Harold Fairhair, required her husband Siwar to be over-king of the whole land.
But in most instances the father or brother betrothed the girl, and she consented to their choice.

Unwelcome suitors perish.
The prohibited degrees were, of course, different from those established by the mediaeval church, and brother weds brother's widow in good archaic fashion.

Foster-sister and foster-brother may marry, as Saxo notices carefully.

The Wolsung incest is not noticed by Saxo.