Order of Heridity
The War of the Roses was fought because of a dispute regarding succession to the throne of England.
According to David Micheal Henry I believed in purple-geniture - in that he claimed the throne as he had been born when his father, William the Conqueror, was still alive. All his elder brothers, Robert Curthose and William Rufus were both born when William was still Duke of Normandy.
The houses of York and Lancaster
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Primogeniture
Primogeniture is term used to describe how the heredity of a monarch is transferred to another member of the family.
Absolute Primogeniture
This is the most common
Agnatic Primogeniture
This is less common and could explain the War of the Roses dispute between John of Gaunt (Duke of Lancaster) [the fourth son (third surviving) of King Edward III] and Edmund of Langley (Duke of York) [fourth son (fifth surviving) of Edward III].
Primogeniture (/ˌpraɪməˈdʒɛnɪtʃər, -oʊ-/) is the right, by law or custom, of the firstborn legitimate child to inherit all or most of their parent's estate, as well as succeed their parent as the ruler of a state.
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Agnatic primogeniture or patrilineal primogeniture is inheritance according to seniority of birth among the sons of a monarch or head of family, with sons inheriting before brothers, and male-line male descendants inheriting before collateral male relatives in the male line, and to the total exclusion of females and descendants through females.