Lateran Treaty
Negotiations for the settlement of the Roman Question began in 1926 between the government of Italy and the Holy See, and culminated in the agreements of the Lateran Pacts, signed—the Treaty says—for King Victor Emmanuel III of Italy by Benito Mussolini, Prime Minister and Head of Government, and for Pope Pius XI by Pietro Gasparri, Cardinal Secretary of State, on 11 February 1929. It was ratified on 7 June 1929. The agreements were signed in the Lateran Palace, hence the name by which they are known.
First Council of the Lateran
Lateran I was the first of four Lateran Councils between the years 1123–1215. The first was not very original in its concept, nor one called to meet a pressing theological question. For the most part, Pope Callistus II summoned the council to ratify the various meetings and concords which had been occurring in and around Rome for several years. The most pressing issue was that of the Investiture controversy which had consumed nearly a century of contention and open warfare. At the heart of the question was the ancient right of the Holy Roman Emperor to name the pope as well as bishops and priests. These would be invested with some secular symbol such as a sword or scepter and the spiritual authority represented by a ring, miter and crosier. To an illiterate population, it appeared the bishop or abbot was now the king’s inferior and owed his position to the king. This issue came to the fore in the first part of the eleventh century when Rome and the pope sought autonomy from the Holy Roman Emperor. It had been a central issue in the reign of Pope Gregory VII and his battles with Henry IV, Holy Roman Emperor. The issue was never settled. Years of teaching by Roman trained priests and bishops in Germany had led to an educated generation which rejected the idea of divine right of kings. 
The Third Lateran Council and the Fourth Lateran Council are generally considered to be of much greater significance than Lateran I. However, Lateran I marked the first time a general and large Council had been held in the West. All previous Councils had been in the East and dominated by Greek theologians and philosophers.
In the struggle between Stephen of England and Matilda, the daughter of Henry I of England, the English Church slipped away from the close control the Normans had exercised. Stephen was forced to make many concessions to the Church to gain some element of political control. Historians have largely considered his rule to be a disaster, calling it The Anarchy.