text: The Byzantine empire gave Geza Arpad one of these objects which is now named for Saint Stephen of Hungary.
full_question: The Byzantine empire gave Geza Arpad one of these objects which is now named for Saint Stephen of Hungary. These objects name a type of phase-transfer catalyst that segregates cations inside a ring of ether monomers. During the Social War, Lucius Cornelius Sulla received a "grass" one of these objects, the highest (*) decoration of the Roman army. In 18th through mid-20th century Britain, these objects named a type of large silver coin worth five shillings. A white and red one symbolizing the unity of Upper and Lower Egypt was often shown in pharaohs' inscriptions. Before the Crucifixion, Jesus received one made of thorns. For 10 points, name these items which are usually heavier than a diadem or tiara, a type of royal headgear.
first_sentence: The Byzantine empire gave Geza Arpad one of these objects which is now named for Saint Stephen of Hungary.
raw_answer: crowns [or Holy Crown of Saint Stephen; or crown ethers; or Grass Crown; or Double Crown; or crown of thorns] 