verb
wed
WED/wed/
To join people in marriage.
The bride and groom exchange a ring as they wed.

Etymology
Old English weddian linked marriage with giving a pledge. English specialized this promise-making sense into marrying, then extended the marital bond figuratively to joining things closely together.
In context
Queen Alicent wanted the princess to wed her eldest son, Prince Aegon, so he could one day be king.