Henry IV vs King Gojong of Goryeo

Henry IV was elected King of Germany in 1056 at the age of six following the death of his father Henry III. His minority led to a regency by his mother Agnes of Poitou, which weakened royal authority.

Henry IV defeated Saxon rebels at the Battle of Langensalza on June 9, 1075. This victory temporarily suppressed the Saxon uprising and strengthened Henry's position before the Investiture Controversy escalated.

Pope Gregory VII excommunicated Henry IV in February 1076 after Henry attempted to depose the Pope. The excommunication freed Henry's subjects from their oaths of loyalty, leading to a rebellion by German princes.

In January 1077, Henry IV traveled to Canossa Castle in northern Italy to seek absolution from Pope Gregory VII after being excommunicated. He stood barefoot in the snow for three days before the Pope lifted the ban, a dramatic act of penance.

Henry IV besieged Rome three times between 1081 and 1084 to force Pope Gregory VII to recognize his authority. He captured the city in 1084 and was crowned emperor by Antipope Clement III, but Gregory VII fled to Salerno.

The Mongol Empire under

After the murder of Mongol overseers, the Mongols launched a second invasion. General Saritai led the attack. Goryeo forces resisted fiercely, but the Mongols devastated the countryside. The invasion ended when Saritai was killed by a Buddhist monk.

King Gojong moved the royal court and government to Ganghwa Island, a fortified location in the Han River estuary. This relocation was intended to resist Mongol demands and protect the monarchy. The court remained there for nearly 30 years.

The Mongols launched a third invasion, focusing on destroying Goryeo's ability to resist. They ravaged the mainland while the court remained on Ganghwa. After years of war, King Gojong agreed to peace terms in 1238, including sending a prince as hostage.

To invoke Buddhist protection against the Mongol invasions, King Gojong ordered the carving of a new set of the Tripitaka Koreana woodblocks. This massive project was completed in 1251, creating a cultural treasure that survives to this day.

After decades of war, King Gojong finally submitted to Mongol suzerainty. He sent his son, the future King Wonjong, to the Mongol court as a hostage. This ended the military resistance and made Goryeo a vassal state of the Mongol Empire.