Otto IV is crowned Emperor of the Holy Roman Empire by Pope Innocent III.

Otto IV was the Holy Roman Emperor from 1209 until his death in 1218.

The Holy Roman Emperor, originally and officially the Emperor of the Romans during the Middle Ages, and also known as the Roman-German Emperor since the early modern period, was the ruler and head of state of the Holy Roman Empire. The title was held in conjunction with the title of King of Italy from the 8th to the 16th century, and, almost without interruption, with the title of King of Germany throughout the 12th to 18th centuries.

The Holy Roman Empire, also known as the Holy Roman Empire of the German Nation after 1512, was a polity in Central and Western Europe, usually headed by the Holy Roman Emperor. It developed in the Early Middle Ages, and lasted for a millennium until its dissolution in 1806 during the Napoleonic Wars. For most of its history the Empire comprised the entirety of the modern countries of Germany, Czechia, Austria, the Netherlands, Switzerland, Slovenia, and Luxembourg, most of north-central Italy and southern Belgium, and large parts of modern-day east France and west Poland.

Pope Innocent III was the head of the Catholic Church and sovereign of the Papal States from 8 January 1198 until his death in 1216.

October 4 is the 277th day of the year in the Gregorian calendar; 88 days remain until the end of the year.