Around 1066 AD William the Conqueror at England/Britain and the Seljuk Turks at where is called Jerusalem/Judea--about 1,000 years after 70AD.
For more about the Seljuq Turks or the Great Seljuq Empire or the Sultanate of Rum or the Khazar Khaganate click here. For more information on the Ottoman Empire aka Turkish Empire click here. Sparta was known to have a dyarchy (double kingship model). AFAIK, Sparta is no more. Perhaps there is some other system known to have a dyarchy or the like. But is it two horns in secession or two horns at the same time?