regnal

reg·nal

 (rĕg′nəl)
adj.
Being a specified year of a monarch's reign calculated from the date of accession: in her 12th regnal year.

[Medieval Latin rēgnālis, royal, from Latin rēgnum, reign; see reign.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

regnal

(ˈrɛɡnəl)
adj
1. (Government, Politics & Diplomacy) of a sovereign, reign, or kingdom
2. (Government, Politics & Diplomacy) designating a year of a sovereign's reign calculated from the date of his or her accession
[C17: from Medieval Latin rēgnālis, from Latin rēgnum sovereignty; see reign]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

reg•nal

(ˈrɛg nl)

adj.
of or pertaining to a sovereign, sovereignty, or reign: the second regnal year of Louis XIV.
[1605–15; < Medieval Latin rēgnālis= Latin rēgn(um) rule, kingdom + -ālis -al1; compare reign]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
Some were sympathetic to the regnal claims of the Catholic, Mary, Queen of Scots.
The absolute chronology of the ancient Near East during the first millennium BCE is principally determined by Ptolemy's (Royal) Canon (see Depuydt 1995a), whose Babylonian segment establishes the onset of the first regnal year of king Nabu-nasir on 26 February 747 as the earliest secure historical date directly linked to the Julian calendar.
(8.) The reference to King Kyanzittha is with his regnal name, Sri-tribhuvanadityadhammaraj, who reigned at Bagan from 1084 to 1113 CE.
(10) Kojong was the last king of the Joseon dynasty and the first emperor of Korea under the regnal name of Gwangmu.
Already known as an able promoter of English and regnal interests from his work for Henry V, especially the massive Troy Book, Lydgate produced during the years of the minority--what Derek Pearsall has called his "laureate" period--a whole series of texts designed to bolster and support the authority of the child on the throne.
Rather, he points out to his reader that these sage rulers all enjoyed very long reigns: 'Fu Xi ruled for 164 years; Shennong ruled for 145 years; the Yellow Emperor ruled for 100 years; Yao ruled for 110 years; Shun ruled for 50 years' ([phrase omitted]) (67) Even for someone whose value system was not aligned with Chinese tradition, the idea of such long regnal periods would likely have had its appeal.
Also, when her son, Prince Albert Edward, succeed the throne, he also used the regnal name Edward VII.
He took George as his regnal name when he became king after his brother's abdication, but his full name was Albert Frederick Arthur George and he was known as Bertie to his family.
Although the title lists Henry's regnal years, the book covers his entire life and is the first full biography of the king to appear in English since 1858.
There's more to Francis, such as a life of simplicity, which has become a hallmark of the Franciscans and which has inspired many people, including the current Pope, who is Jesuit but chose Francis as his regnal or papal name.
Among the Visigoths, the donation of crowns predates the wearing of crowns as a regnal marker, a practice which is associated with Leovigild's desire to create a hereditary kingship and his attempts to distinguish his family from other noble families (Miles 22).