Regnal year
year(s) of the reign of a sovereign (in ordinal timeline)
A regnal year is a year of the reign of a sovereign, from the Latin regnum meaning kingdom, rule. Regnal years considered the date as an ordinal, not a cardinal number. For example, a monarch could have a first year of rule, a second year of rule, a third year of rule, and so on, but not a zeroth year of rule.
Applying this ancient epoch system to modern calculations of time, which include zero, is what led to the debate over when the third millennium began. Regnal years are "finite era names", contrary to "infinite era names" such as Christian era, Jimmu era, Juche era, and so on.
Early use
In ancient times, calendars were counted in terms of the number of years of the reign of the current monarch. Reckoning long periods of time required a king list. The oldest such reckoning is preserved in the Sumerian king list. Ancient Egyptian chronology was also dated using regnal years. The Zoroastrian calendar also operated with regnal years following the reform of Ardashir I in the 3rd century.
The public source identifies “Regnal year” as year(s) of the reign of a sovereign (in ordinal timeline). This brief keeps that definition visible, then builds a research path around Regnal, year and reign.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Regnal year”, the useful work is to connect “year(s) of the reign of a sovereign (in ordinal timeline)” to the records capable of establishing context and consequence.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated May 26, 2026. The linked authority identifier is Q17150160. None of the 0 selected statements returned an explicit reference.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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Three-step research path
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Questions for further research
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This entry incorporates text from “Regnal year” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.