Okay, so John, Duke of Albany, was the heir presumptive to the throne of Scotland between the death of James IV's younger son, the duke of Ross, and Albany's own death. However, Albany never had legitimate children of his own. His wife died in 1524, but in the remaining 12 years of his life, Albany never remarried. Who would be a good wife for him to remarry to? And how would this affect the future of Scotland (assume James V still runs as OTL leaving a daughter)? Male issue of Albany would be pretty clear cut successors in the event of James V dying without male issue (unless James changes the succession law - don't know how likely that is though).