Hello!
I've been digging up things about those people in Hungary, and influenced by my findings, I've made some changes to mostly the 1066 scenario, mostly regarding names and some traits. Firstly, I've expanded the names of Hungarian characters in the appropriate file, and also removed many of them, due to those being rather modern forms, and thus some characters in the 1066 scenario got renamed as well. An example of this is that Géza is no longer a name, and is replaced by Gyécsa and Décse, and their non petitised forms Győ and Décs. The other things were some historical changes to them, and introducing a couple of friendship relations. You might want to take a look into it, and maybe use it, I leave that up to you entirely.
This is the link of the miniscule pack:
http://snk.to/f-ct9er58p
King István I
Dead, but modified nonetheless. His ascension to High/Grand Princedom was a very much illegitime transition of power, because salic law was not indtroduced before the estabilishment of the Kingdom, and his father's and mother's naming him as heir was an arbitary decision, turning succession upside down. He also very much trusted his wife and mother, including the former's foreign routine. He might not have been one of bad intentions, and he is very popular as a King and Saint today, but in the end he ended up pretty much a kinslayer and one under the control of certain people, which resulted in his and his son's very probable assassinations, either by those he trusted, or by those he wrongdoed. I gave his wife the trait deceitful.
http://imageshack.com/a/img841/8789/cedn.png
Ernye Szalók aka Ernye of Clan Szalók =Szalók nembeli Ernye (renamed from Ernyei Szalók)
I am not sure if he was indeed from the Szalók Clan, but one of King Salamon's loyal routine was called Ernye, who along with Vid of Clan Gútkeled died in a losing battle against Géza (aka Gyécsa) and László. He was likely a somewhat talented soldier, and he was doubtlessly loyal and a friend of the King. His traits were changed accordingly, so he can put up a good fight against the pretenders.
http://imageshack.com/a/img4/6556/uyg7.png
Queen Jutta
There is enough to read up about her. In nutshell, her friendship with her husband and his mother is introduced, because when the relationship of those two has cooled down due to governance and policy disagreements, she intervened, resulting in her husband not slapping her mother-in-law, which could have been a rather serious offence.
http://imageshack.com/a/img707/2694/trqm.png
Royal Prince Lampert
Not much is known about him during his brothers' reigns as Kings (before that, he along with László were pleading Duke Boleslaw II for help against King Salamon, for their brother, Gécsa's sake). It is still mentioned though, that he governed his estates in peace, and thus efficiently, furthermore, no mentions of him ever claiming the throne was made. The result of this was I preserving his modest trait, but changing his talent to silver tongue (due to his estate governance lifestyle and his apparent position as steward at the start of the game) and also added the trait amiable.
http://imageshack.com/a/img191/6963/ajq6.png
Royal Prince Dávid
He was a little like Lampert, but with the difference that he was the brother of King Salamon, and was not interested in politics of his relatives at all. He later became a priest and donated large sums of money. So he now received the trait generous and lost arbitary. Furthermode, I did not change him to ecclesiastical education, I left it martial and added romantic trait, which is because he probably will get the event to change it later on, while leaving the possibility that he might not, and could may become a fine soldier. He was not bastard, and wife and children are esclusively 'not known' status instead of 'none', so he might had some, raising his fertility thus was also done by me.
http://imageshack.com/a/img692/1407/p3v4.png
Sheriff of Bács, Vid of Clan Gútkeled =Gútkeled nembeli Vid
Was probably the closest associate of King Salamon, inarguably the person he trusted the most, which actually meant something, considering he did not trust many people to begin with! Vid's preset traits were not changed, because he truly was a Grey Eminence behind the King, deceitful, becaue he kept encouraging him successfully, among many things to make attempts to remove all pretenders, namely Gyécsa and his siblings (however, at the start of the game, the relationships of the Princes and the King are harmonious, so they have no specific friend/rival relations). He thus received the trait loyal, and is a friend to King Salamon. His son, Keled is now a tough soldier, these all done to make a clique which might give them better chances in preventing total state fragmentation, which usually happens in the game. He was actually german from Swabia, but I did not change that due to his estabilished Clan's amalgamation.
http://imageshack.com/a/img818/5837/91ba.png
King Salamon
There is a generous amount of information about his life and death, still many disregard his abilities, particularly as a military leader. He did not trust many people, including her mother later on, so he was quite the opposite of the 'mother-loving tyrant' archetype. He had to face numerous threats to his rule and his life, and is among the few Hungarians Kings of the Árpád Dynasty who was not murdered, but died in a battle. Accounts tell of his life after losing the throne and failing to gain back the throne, how he went abroad to engage himself in military affairs as an adventuring knight, and how he joined a pecheneg chief Tselgou in attempting to capture none other than the city of Constantinople. However after their defeat, and Tselgou's death at the Battle of Chariopolis, he was chased into an abandoned castle near the Danube, where he made his stand and died next day, when he bravely charged out and was cut down along with his routine in the ensuing melee. He is no longer infertile, received boosts to some of his abilities, and also was given the trait valorous. Along with his friendship with the "Marshall" Ernyei, he might now easier become a good soldier as he was historically. There are some legends in Pola about his survival and eventual pious life there, but I did not regard them as facts for changing his traits further, as we all need the historical confrontation with his relatives. He has a rivalrly with now young Nikephoros Synadenos, who upon being defeated only submitted to Gyécse (thus midly suggesting he did not recognize Salamon as his overlord), triggering the great feud between the Árpád relatives, which later resulted in Salamon losing the throne to Gyécsa.
http://imageshack.com/a/img829/5577/oc4k.png
There were other minor changes, mostly regarding names and Ince Balog's father renamed to Altmann von Freidberg Balog and recultured as german. Ilya of Clan Bikács has his abilities improved a bit, but since I do not know anything about him, I've made no further changes.