What causes the death of roland?

Roland dies from his injuries sustained during the Battle of Roncevaux Pass, where he bravely fights against overwhelming odds. He suffers a mortal wound from a sWord blow to his temples, which ultimately leads to his demise. Despite his efforts to summon aid by blowing his olifant horn, help arrives too late, and he succumbs to his injuries, symbolizing the themes of heroism and sacrifice in the face of adversity.