Randomly
On many occasions, a king often picked his wife randomly after genuinely falling in love or being attracted to a lady he came across or met. Such relationships often brought disputes in the royal home especially if the chosen lady was not of royal lineage, from a well to do home or from the kingdom. Many princes in this situation often run off with the love of their lives or refuse to be crowned King. After a while, kings were allowed to marry who they genuinely wanted to.
