An idea I was discussing with @Zulfurium, namely what if John of Gaunt and Constance of Castile had had more kids. Katherine, likely as not would not end up marrying the king of Castile with a surviving brother much less two, since her not being the only child of her parents would mean that the Trastamaras don't amalgamate the line of Pedro the Cruel TTL.
John, Duke of Lancaster (1340-1399) m: 1371 Constanca of Castile (1354-1394)
Katherine (b.1372)
John (1375-1375)
Edward (b.1379)
Peter (b.1382)
Mary (b.1383)
@The Professor @isabella @VVD0D95 @curlyhairedhippie @Kurt_Steiner
@Jan Olbracht @krieger
John, Duke of Lancaster (1340-1399) m: 1371 Constanca of Castile (1354-1394)
Katherine (b.1372)
John (1375-1375)
Edward (b.1379)
Peter (b.1382)
Mary (b.1383)
@The Professor @isabella @VVD0D95 @curlyhairedhippie @Kurt_Steiner
@Jan Olbracht @krieger