The publication of the Chronicles and Memorials of GreatBritain and Ireland during the Middle Ages, known familiarly as the Rolls Series, was the outcome of a movement set on foot early in the nineteenth century by Henry Petrie. Petrte (1768-1842), who began life as a dancing master, made himself a learned and zealous antiquary, and acquired a knowledge, unrivalled in his day, of the materials for early English history. He was patronized by the second earl Spencer (1755-1834), then engaged upon the enrichment of Althorp library, and in 1818 a meeting of noblemen and gentlemen was convened at Spencer House to induce the government to support a scheme for printing the early sources of British history. The project was approved by the then prime minister, Lord Liverpool, and took shape in an humble address of the House of Commons to King George IV (25 July 1822), begging for the publication of manuscript sources of history; as a result of this Petrie, who had been appointed Keeper of Records in the Tower of London in 1819, assembled extracts from various sources for the period before the Norman Conquest, which were published posthumously in 1848 as Monumenta Historical Britannica. This was a selective collection, modelled on the Recueil of the Maurist Dom Bouquet, which Guizot had continued in France. Petrie's Monumenta was inordinately costly, while it failed to give real satisfaction to historians.