Where can I find any chronological timeline information for the 12th or 13th centuries for my studies about Medieval History?

In addition to the sources described by the first response, there are many options for learning more about the Middle Ages. Certainly one major font of information is in literature, and the timeline approach to studying history is revealed in the changes seen in written literature, as it becomes more refined and sophisticated over time. Medieval literature's timeline is particularly fascinating, for it provides the basis for the literary and intellectual phenomenon of the Renaissance,...

In addition to the sources described by the first response, there are many options for learning more about the Middle Ages. Certainly one major font of information is in literature, and the timeline approach to studying history is revealed in the changes seen in written literature, as it becomes more refined and sophisticated over time. Medieval literature's timeline is particularly fascinating, for it provides the basis for the literary and intellectual phenomenon of the Renaissance, from which western culture emerged. 

Dr. Wheeler's Medieval Literature Resources contains many very useful links for exploring the world of medieval literature and its historical context. There are links to many different aspects of medieval history including the Black Plague, chivalry and courtly love, and chronicles of war.

The are also specific timelines from 400 AD through 1400 AD, the entire range of Medieval history. The specific timeline for 1200-1300 includes such events pertaining to the Church, such as the start of the Fourth Crusade and the founding of the Franciscan order, as well as the appointment of several different Popes. This time period also saw the invasion of China, Persia, Russia and other countries by the Mongols and their leader Genghis Khan. Great Britain, a nation widely associated with the Middle Ages because of stories that inspire fascination with this period, saw many important events as well, including the battle for the independence of Scotland led by William Wallace (whose story was told in the film Braveheart). These and many other important historical events are detailed in the timeline provided.