The Adalian nobility is a highly elitist culture, with the vast majority being humans, in power of the country of Adália for centuries. They lead the political and military functions of the country, and exert their authority under the rule of the Diarchy, following the same laws of birthright.
Shared customary codes and values
The Kingdom of Adália blesses the autonomy of nobles in ruling the land for both Kings in a variety of forms, all of them under the almost religious ideal of following the Hero's Peace and their legacy as the foundations for where the country stands. Some of the notable figures being Adaly Blazewood, the first Vice-Queen that unified the country once and for all, the Twin Queens that established the importance of two wise and strong voices to rule in peace, and Americus the Royal, the vice-king that led the country through the War of Flames when the night was darkest. Adálian Nobility is greatly egalitarian, with the firstborn having the birthright regardless of gender. When a couple of title is wed, they are meant, in the eyes of the crown, to rule side by side. Generally, when the specific person that inherited a title dies, the title moves on to his daughter or son, unless the heir temporarily abdicates to assume the position. In case of the birthright is required to a more distant relative, the issue should be solved by a higher authority. Family names and loyalty may be included in assuming a position, as the crown discourages collection of titles on individuals. In case both individuals have a title, they may exert their right or pass ahead, rarely they can have more than two. When the parents cannot hold the title for longer, for whatever reason, one of the titles will go to the second heir in line, instead of only one acquiring them both. This idea helped many families to keep marrying among themselves, and preventing to overthrow their own family members. The couple may also choose which family to pass on the name, although some will keep both last names in individuals. Generally non-direct heirs go on to prioritize the family of their partner. This partnership between the parties not always works, but is inherently part of the sense of community Early Kings had before the conquest, and what ultimately the lack of, lead them to their demise. The idea was solidified by the Twin Queens, that established the Diarchy of Adália, and always being highlighted in history whenever the best features of said ruling appear. Many refer to it as the act of "Ruling like the Twins".
Coming of Age Rites
The interests of a relationship totally depend on what condition is in and what duties a family has. Baronets tend to marry to lesser nobles or merchants with no noblemen due to their only real duty to keep a title is pay a loan to the government every year, so keeping their investments safe and having a good relationship with a rich family is in their best interests, especially if the spouse is knowledgeable on these matters. Barons tend to marry Viscounts and members of high society that may greatly benefit their city in some way or another, sharing ruling with them. Viscounts and Counts are more interested in strong alliances that may secure their investments and management over their own ruling. Marquises and Cradle Knights seek for families that can either have a military influence, either by a number of vassals and soldiers, or that put them in a tactical advantage to back up their defenses in a matter of war. Dukes try to marry their children with Knights of Cradle, heirs to the throne, and members of high society that can turn into key players of massive scales of investment. It is also quite common for Dukes to marry people from abroad, making sure alliances outside of the realm are secure. The Royal family will usually choose a worthy descendent of the Dukedoms, or a hero of which the public image they might use. The equality in rights of ruling may differ from family to family, on what leverage they have and how important the spouse joining the government is inside this other family. Some nobles prove themselves and gain more credit in both parties after a wedding, others simply enjoy the quality of life their name can provide. It is not unusual for couples to marry one day before they met, however when matters of sharing the rule are likely to happen, there might be a courtship where they both can know if it is a wise choice. While the wedding might not give them a say on it, they might plead for another partner within this family. Although it goes unmentioned, many couples don't stay in a physical relationship for long. Women may tightly schedule their cycles to avoid giving birth to a bastard, aborting when they're not sure, and trying to provide at least three children. Those open couples may not hate each other, but go into a mutual agreement on how to live their lives away from their parents, and sometimes, from each other, while still collaborating for their families and children's future.