An idea that
Vladimir Monomakh, Count of Rostov, grandson of Yaroslav the Wise
Code:
character = {
id = { type = 10 id = 666 }
name = "Vladimir 'Monomakh'"
gender = male
dynasty = { type = 12 id = 705 }
father = { type = 10 id = 630 }
mother = { type = 10 id = 1727 }
country = C574
religion = orthodox
culture = Russian
score = { gold = 125 prestige = 100 piety = 100 }
birthdate = { year = 1053 month = january day = 1 }
dna = "94559712182969"
attributes = {
martial = 7
diplomacy = 9
intrigue = 6
stewardship = 9
health = 8
fertility = 6
}
traits = {
wise = yes
just = yes
court_education = yes
}
}
and
Gytha Godwinson, daughter of Harold Godwinson
Code:
character = {
id = { type = 10 id = 127 }
name = "Gytha"
gender = female
dynasty = { type = 12 id = 755 }
father = { type = 10 id = 122 }
mother = { type = 10 id = 123 }
country = DENM
religion = catholic
culture = Saxon
birthdate = { year = 1054 month = january day = 1 }
dna = "06500942693939"
attributes = {
martial = 4
diplomacy = 7
intrigue = 6
stewardship = 4
health = 4
fertility = 8
}
traits = {
ecclesiastical_education = yes
}
}
are married.
Code:
marrige = {
primary = { type = 10 id = 666 }
secondary = { type = 10 id = 127 }
startdate = { year = 1066 month = january day = 1 }
}
It is said that the successor of Vladimir Monomakh, Mustislav the Great (1076-1132), is the eldest son of Vladimir and Gytha.
Since the marriage between Catholic and Orthodox seldom occurs in the game, I think scenario setting is needed - yet they have to spend a period of white marriage. 
Sincerely,