What was the role of noblewoman in the feudal times?

Answer 1

That varied hugely from society to society - Great Britain had a number of Queens as sovereign rulers (as opposed to the more common use of the title denoting the sovereign ruler's wife or mother).

That said, in the standard/stereotypical system, with a higher-ranked husband, the noblewoman still generally served a number of important functions:

Gracious hostess - If visitors arrived with the lord away (hunting, at war, touring his domain, whatever), it would be expected for his wife to greet the guests and see that they were made comfortable.

Steward - Many societies split the steward duties among several ranking officials - a chief of servants, chief guardsman, stablemaster, craftsmen (either individually, by council, or by a single representative), but the lord's wife usually had the task of coordinating their affairs when the lord wasn't available. The rank of Steward was often used for the chief of servants specifically, but could also be used for a stand-in lord (Regent is, I believe, specific to stand-ins for royalty, but its general meaning is similar).

Spy - It depends on the court, but a large percentage of medieval European cultures had very cutthroat politics (often literally - missteps could cost you your life). Because of the prevailing view of genders at the time, gossip was widely accepted among women, unlike the closely scrutinized discussions between lords. Furthermore, men have a tendency to boast in order to impress women, and may give up important information accidentally in the process.

Alliance fixer - Medieval alliances between houses were often sealed through intermarriage of the houses, both within a nation and between nations. Such political marriages required women be available to marry off to potential allies.

There are probably others I'm not aware of, though it must be said that at least a few had no interest in politics or leadership at all.

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In feudal times there was no such country as Great Britain.

England at that time did not have many female rulers either, only Matilda was favoured as an heir by the rulong monarch and she was never crowned. Her son was placed next in line of succession to Stephen, who usurped her position.

It was not until the Tudor period when the male line was broken did a number of female rulers emerge.