July 18 in History

The Roman–Persian wars, also called the Roman–Iranian wars, took place between the Greco-Roman world and the Iranian world, beginning with the Roman Republic and the Parthian Empire in 54 BC and ending with the Byzantine and the Sasanian empires in 628 AD. While the conflict between the two civilizations did involve direct military engagements, a significant role was played by a plethora of vassal kingdoms and allied nomadic tribes, which served as buffer states or proxies for either side. Despite nearly seven centuries of hostility, the Roman–Persian wars had an entirely inconclusive outcome, as both the Byzantines and the Sasanians were attacked by the Rashidun Caliphate as part of the early Muslim conquests. The Rashidun offensives resulted in the collapse of the Sasanian Empire and largely confined the Byzantine Empire to Anatolia and southeastern Europe for the ensuing Arab–Byzantine wars.

Li Shiji, courtesy name Maogong, posthumously known as Duke Zhenwu of Ying, was a Chinese military general and politician who lived in the early Tang dynasty. His original family name was Xú, but he was later given the family name of the Tang imperial clan, Li, by Emperor Gaozu, the Tang dynasty's founding emperor. Later, during the reign of Emperor Gaozong, Li Shiji was known as Li Ji to avoid naming taboo because the personal name of Emperor Gaozong's predecessor, Emperor Taizong, had the same Chinese character "Shi". Li Shiji is also referred to as Xu Maogong and Xu Ji in the historical novels Shuo Tang and Sui Tang Yanyi.

Edward I, also known as Edward Longshanks and the Hammer of the Scots, was King of England from 1272 to 1307. Concurrently, he was Lord of Ireland, and from 1254 to 1306 ruled Gascony as Duke of Aquitaine in his capacity as a vassal of the French king. Before his accession to the throne, he was commonly referred to as the Lord Edward.

The Kingdom of France is the historiographical name or umbrella term given to various political entities of France in the medieval and early modern period. It was one of the most powerful states in Europe from the High Middle Ages to 1848 during its dissolution. It was also an early colonial power, with colonies in Asia and Africa, and the largest being New France in North America geographically centred on the Great Lakes.

The College of Arms is the heraldic authority for England, Wales, Northern Ireland, and some Commonwealth realms; the heraldic authority for Scotland is the Court of the Lord Lyon. The College is a royal corporation consisting of professional officers of arms who act on behalf of the Crown in matters of heraldry, including the granting of new coats of arms; genealogical research; and the recording of pedigrees. The College is also responsible for matters relating to the flying of flags on land, and maintains the official registers of flags and other national symbols. It is also involved in the planning of ceremonial occasions such as coronations, state funerals, the annual Garter Service, and the State Opening of Parliament. The officers of arms accompany the monarch on many of these occasions.