The Sixth Crusade: Frederick II, Holy Roman Emperor, signs a ten-year truce with al-Kamil, regaining Jerusalem, Nazareth, and Bethlehem with neither military engagements nor support from the papacy.

Sixth Crusade
The Sixth Crusade (1228–1229), also known as the Crusade of Frederick II, was a military expedition to recapture Jerusalem and the rest of the Holy Land. It began seven years after the failure of the Fifth Crusade and involved very little actual fighting. The diplomatic maneuvering of the Holy Roman Emperor and King of Sicily, Frederick II, resulted in the Kingdom of Jerusalem regaining some control over Jerusalem for much of the ensuing fifteen years as well as over other areas of the Holy Land.
Frederick II, Holy Roman Emperor
Frederick II was King of Sicily from 1198, King of Germany from 1212, King of Italy and Holy Roman Emperor from 1220 and King of Jerusalem from 1225. He was the son of Emperor Henry VI of the Hohenstaufen dynasty and Queen Constance I of Sicily of the Hauteville dynasty.
Ceasefire
A ceasefire, also spelled cease-fire, is a stoppage of a war in which each side agrees with the other to suspend aggressive actions, often due to mediation by a third party. Ceasefires may be between state actors or involve non-state actors.
February 18
February 18 is the 49th day of the year in the Gregorian calendar; 316 days remain until the end of the year.
Al-Kamil
Al-Malik al-Kamil Nasir ad-Din Muhammad, titled Abu al-Maʽali, was an Egyptian ruler and the fourth Ayyubid sultan of Egypt. During his tenure as sultan, the Ayyubids defeated the Fifth Crusade. He was known to the Frankish crusaders as Meledin, a name by which he is referred to in some older western sources. As a result of the Sixth Crusade, he ceded West Jerusalem to the Christians and is known to have met with Saint Francis.