Has there been a female knight?
There are a couple of examples that we know about, though not very many. Eleanor de Montfort led the defence of Lydford Castle in 1217 when it was attacked by King John. In medieval England, women of all classes were considered as bona fide property and could be traded like any other commodity or piece of chattel. As such if you owned land or herds they automatically passed to your daughter and she became part person in them on her marriage while if he son predeceased then his daughter could inherit them upon reaching adulthood under common law (though Scottish law preferred daughters). Women too during early feudalism inherited more land than they do today – so again women had some rights.