DXXXV

DXXXV is a Roman numeral representing the number 535. It is composed of D (500) plus XXX (30) plus V (5). In Roman numerals, DXXXV can denote the year 535 in CE (and, in some contexts, its BCE equivalent) or serve as a numeric designation in lists or sequences.

If referring to year 535 CE, it occurred during the early Byzantine era, in the reign of Emperor Justinian I, who pursued efforts to reconquer the western Mediterranean. The year is notable in historical and climatological scholarship as the onset of a significant climatic anomaly that persisted into the following year.

The climatic event around 535–536 is documented as causing unusual cooling, crop failures, and famines across various regions. A tropical volcanic eruption is widely proposed as the source, though the exact eruption remains uncertain; Ilopango in present-day El Salvador is among the frequently cited candidates. The event likely affected regions across Europe, North Africa, and Asia, contributing to social and economic stress in the period.

Beyond its use as a numeral, DXXXV appears in inscriptions, monuments, and printed materials where the number 535 is needed for labeling, dating, or enumerating items. In such contexts, it carries no inherent historical meaning beyond its mathematical value.