Which emperor built the Pantheon's surviving form in Rome?

Hadrian was Roman emperor from 117 to 138. His form of address as Roman emperor was Imperator Caesar Traianus Hadrianus Augustus. Hadrian was born in Italica, in the present-day Andalusian province of Seville in southern Spain, an Italic settlement in Hispania Baetica; his gens Aelia came from the town of Hadria in eastern Italy. He was a member of the Nerva–Antonine dynasty.