Bestie I'm in love with your lady Port and now obsessed with her also having an harem, and I know you're talking about the canonverse but it made me think of an royalty au and thought u might like it.
So basically, she's a princess and a knight (named by her people "the blue dragon")
Arthur- is her "official husband". he's the consort prince and the one to show more often right at her side during meetings and stuff. Arthur is from another house and her childhood friend. Cares for her a lot but still can't help getting involved with his maid (Amelia) and with his mortal enemy (Francis) who he insist he has no involvement with.
Antonio- her brother who was the one actually chosen by their father to spouse her (bc keeping the blood pure and all that crap). Beatrix (I think this is the name you gave for her right?) Likes him, but not enough to marry him. Antonio feels the same (he loves Romano and she allows their hidden relationship) but is also very overprotective over her so he accepted the marriage to protect her. He and Arthur bicker a lot and headbut over decisions and her attention.
Abel- a fellow knight, her rival. Enemies to lovers stuff 😉. Accepted to marry her help elevate his status (like in canon he thinks about money a lot). Cares about her too but will not let it show (don't worry she knows lol).
Kiku- a friend from overseas. A xogum she married for political benefits, a lovely friend that stays in his lands but they often talk through letters. When she visits they make up for their distance with a chat with tea and in his bed :}
Cheng- one of Yao's sons. Married to her while young for political reasons. Was shy around her at first. She's very protective of him so she makes sure he has bodyguards following him around the land wherever he goes.
Heracles- a philosophers she meet during her travel to Greece. A sleepyhead that always provides the best insights and advices. When her life gets busy and other nobles (even her other husbands) get on her nerves she goes to him to listen to him and pet his cats. He moved to her kingdom and spends his time studying and teaching his philosophy and hoarding every stray cat he sees.
Luciano- and least but not last. He's a prince from a rival kingdom. He had no interest in marrying her because he suspected that would allow her and the other kingdom to take advantage of this union to benefit them. But Beatrix kept her promise to respect his kingdom's sovereign. He and Cheng are the youngest but unlike him , he has no problem on call her out and disagree with her decisions. Beatrix finds his rebelliousness charming.
OMG BESTIE YOU MADE THE FULL WORLD IN A POST.