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The last reigning member of Aragonese royal house of Barcelona was Martin I the Humane. Martin had three sons (Martin the Younger, king of Sicily, James and John), but only one of them (Martin the Younger) had survived to adulthood. It led to the interregnum after sonless (at least legitimate) death of Martin the Younger and his father. But what if younger sons of Martin I survived? There wouldn't be any interregnum after Martin's death, because James would immediately become James III after his father's death. Would Martin still strive to legitimize his illegitimate grandson (through Martin the Younger) Frederick, while having two surviving legitimate sons ready to inherit crown? How would lack of House of Trastamara on Aragonese throne affect Iberian history? @Kellan Sullivan@isabella