spoilers ahead
This might be a bit long, but it's mostly due to how complicated things get.
>Whole story
The main antagonist of the series is Albert de Blois, Victorique's father, head of the Ministry of the Occult, and later the Prime Minister of Sauville for a short time. First and foremost a noble, what little the series reveals about his personal life, he's an eccentric and has quite a bit of both money and power at a young age.
As a young man, he observed Leviathan (an infamous alchemist) conjure gold from thin air for the King of Sauvilla in the late 19th century. At that moment he was captivated with the occult, and felt contempt for those who were abandoning religion and superstition for Science instead. Upon finding that Leviathan was a fraud, he still had faith in the Occult, but learned how it could be used to easily deceive and control others. At that point in time, he realized that he could take Sauville and build it into a world power if he played his cards right. First he needed a gray wolf, however.
Here is where Cordelia Gallo (Victorique's mother) comes into play. 1910, Saubreme, Sauville's capital, Albert has been watching Cordelia for quite some time at a local Cabaret club. He knows that she's an exiled gray wolf and takes the opportunity to kidnap, rape her, and keep her in captivity until she gives birth. Once Cordelia gave birth, he released her into an insane asylum and kept Victorique for himself. For at least 10 years Victorique was imprisoned in the de Blois Castle, locked away and given nothing but books to read. Military history, psychological theory, works of philosophers, scientific manuals, anything that would condition her into being a grand strategist. Moving her into the Academy library in her very young teens, he gave her an even wider selection of books to read, while keeping tabs on her at any given time. There was never a point where he didn't know where she was.
In early 1925, he used Victorique as a religious figure to stir the masses and prepare for the second world war. Using her gifted intellect and book knowledge, he managed to eliminate enemies of the state and position himself as PM as well as ally Sauville with Germany. During his grand inauguration speech, however, Cordelia set up an ambush and killed him, allowing Victorique to escape just before the war truly started. His death is assumed to cause the collapse of Sauville's political and military structure though, leaving the nation defenseless during the war.
>How he threatened her/did he regret it
Initially it was just with imprisonment and control, he broke her at a young age psychologically. By the time she was a teenager she was callous and cynical, but complacent to an extent. To sum it up in her own words, she didn't fear death because she had nothing to live for. Once she met Kujo, however, he used him to threaten her and keep her in line, whether it be by detaining, deporting, or killing him. He didn't regret it, however, as he saw her as a tool rather than a human being, which he mentioned multiple times.
>How she felt/dealt with it
She didn't really deal with it, nor did that pansy Kujo (which I will always hold against him for not manning the fuck up. A big reason why I don't think he deserves her love.) It was Cordelia who ended up killing him and herself in revenge. For the most part though, Victorique was indifferent about the man, never showing overt hate surprisingly. Perhaps she felt there was too little of a connection to even express feelings towards him.
>Overall what he did
-Caused Victorique to act the way she does
-Caused her to be a bastard child
-Assumed to be a partial cause of WW2
-Partially responsible for the destruction of Sauville during WW2 (Dresden-tier annihilation, main cities being totally flattened)
-Responsible for the death of Victorique's mother, Cordelia.
Overall he's a horrible man, but at the same time, without him Victorique never would have been born nor would she have had her personality. I can't just wish that he never existed because of that, but perhaps he could have treated her differently and yet still have gotten what he wanted. Friendly reminder that Kujo never stepped up to the plate to stop any of his plots either, thus making him an unfit protagonist or lover.