| ...In particular, it is believed I. predicted the Northern Wars (1239–1268), the Great Plagues (1268, 1272 and 1294), the bloody War of the Two Unicorns (1309–1318) and the Haak Invasion (1350)...
— pg(s). 283, Baptism of Fire (UK edition)
The War of the Two Unicorns (1309-1318) is mentioned in the Encyclopaedia Maxima Mundi as having been prophesied by Ithlinne, though not many other details exist. The prophecy also says that war was very bloody.
Maybe, one of the "unicorns" in question is Kaedwen, based on their coat of arms, but the other unicorn remains a mystery. It may also be a civil war between two princes from the Kaedweni House of Unicorn.