CMXXII

CMXXII is the Romans' notation for the number nine hundred and twenty‑two (922). It is formed by the subtractive notation of CM (900) plus XX (20) and II (2). The numeral appears in a variety of contexts, ranging from calendar designations in medieval manuscripts to modern identification numbers for vessels, vehicles or military units. In historical references the year 922 CE is sometimes rendered as CMXXII in Latin annals and chronicles.

The year 922 lies within the late early Middle Ages. In Western Europe, the Carolingian Empire was continuing its fragmentation; the Treaty of Verdun had concluded a century earlier, leaving the Frankish realms divided among heirs. In 922 Bavaria saw the reign of Duke Henry the Wrangler who asserted influence over neighboring territories. In the Iberian Peninsula the Taifa kingdoms of Al-Andalus were in fluid conflict with Christian kingdoms such as León and Castile, while the Umayyad Caliphate of Córdoba was at its zenith. In the Byzantine Empire, Emperor Romanos I Lekapenos' dominance was beginning to wane, setting the stage for the eventual fall of the Macedonian dynasty later in the century. Outside Europe, 922 CE corresponds to the 247th year of the traditional Chinese calendar, a period during the rule of Emperor Qi in the Tang dynasty.

Roman numerals such as CMXXII occasionally appear in modern contexts: the merchant navy may designate a ship by this number; some train and bus routes use Roman numerals to differentiate lines; military units in Britain and elsewhere sometimes bear designations with Roman numerals. In all such uses the number denotes an ordinal position, a model number, or simply an identifier.