 The popularity of these works shaped how crusading was viewed in the medieval mind and Robert's work was the source of the 10,000 line , epic poem, about the crusade called .The crusades in memory were shaped by these works; with Godfrey as the primary leader, the miracles of the Holy Lance and revelling in the violent sack of Jerusalem.Steven Runciman's literary three-volume work "A History of the Crusades", published between 1951 and 1954, significantly shaped the popular perception of the crusades in the later 20th century.