You will be given a definition of a task first, then some input of the task.
In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.

Passage: Stephen Tvrtko I (, / ; 1338 10 March 1391) was the first King of Bosnia. A member of the House of Kotromanic, he succeeded his uncle Stephen II as Ban of Bosnia in 1353. As he was a minor at the time, Tvrtko's father, Vladislav, briefly ruled as regent, followed by Tvrtko's mother, Jelena. Early in his personal rule, Tvrtko quarreled with his country's Roman Catholic clergy, but later enjoyed cordial relations with all the religious communities in his realm. After initial difficulties the loss of large parts of Bosnia to his overlord, King Louis I of Hungary, and being briefly deposed by his magnates Tvrtko's power grew considerably. He conquered some remnants of the neighbouring Serbian Empire in 1373, after the death of its last ruler and his distant relative, Uros the Weak. In 1377, he had himself crowned King of Bosnia and of Serbia, claiming to be the heir of Serbia's extinct Nemanjic dynasty.
Link Information: Vladislav was a younger son of Stephen I, Ban of Bosnia, and Elizabeth of Serbia. Answer: Stephen I, Ban of Bosnia
Output:
What was the name of Stephen's paternal grandfather?