Excerpts from Books and Wikipedia
"Henry V (…) was King of Germany (from 1099 to 1125) and Holy Roman Emperor (from 1111 to 1125), the fourth and last ruler of the Salian dynasty. Henry's reign coincided with the final phase of the great Investiture Controversy, which had pitted pope against emperor. By the settlement of the Concordat of Worms, he surrendered to the demands of the second generation of Gregorian reformers. . . . In the Concordat of Worms, signed in September 1122, Henry renounced the right of investiture . . . and promised to restore all church property." [Wikipedia] "This concordat ended the investiture struggle, but bitter rivalry between emperor and pope remained." [Wikipedia: Timeline of Middle Ages]