Stephen III of Hungary
... that in a reign of ten years, Stephen III of Hungary had his throne usurped twice and fought a series of wars with the Byzantine Empire, before dying at the age of 25?
... that in a reign of ten years, <b id="mwCX0"><a href="./Stephen_III_of_Hungary" id="mwCX4" rel="mw:WikiLink" title="Stephen III of Hungary">Stephen III of Hungary</a></b> had his throne usurped twice and fought a series of wars with the <a href="./Byzantine_Empire" id="mwCX8" rel="mw:WikiLink" title="Byzantine Empire">Byzantine Empire</a>, before dying at the age of 25?