He ruled jointly with his younger brothers Louis and Henry VI .
Otto III ( c. 1265 -- 25 May 1310 ) , a member of the House of Gorizia ( Meinhardiner dynasty ) , was Duke of Carinthia and Count of Tyrol from 1295 until his death .
Otto III ruled jointly with Otto III 's younger brothers Louis and Henry VI .
Otto III ( c. 1265 -- 25 May 1310 ) , a member of the House of Gorizia ( Meinhardiner dynasty ) , was Duke of Carinthia and Count of Tyrol from 1295 until his death .