He and his brother Charles IX ( 1604 – 11 ) adopted regnal numbers according to Johannes Magnus's partly fictitious history of Sweden.

Ordinal numbers or regnal numbers are used to distinguish among persons with the same name who held the same office.

For example, Boris III of Bulgaria and his son Simeon II were given their regnal numbers because the medieval rulers of the First and Second Bulgarian Empire were counted as well even if the Saxe-Coburg dynasty dated only back to 1887 and were only distantly related to the previous monarchies.

When first admitted to the bar as a young advocate in 1953, Hamilton refused to swear allegiance to Queen Elizabeth II arguing that she could only be referred to as " Queen Elizabeth " ( sans regnal number ) in Scotland as the regnal numbers counted Queen Elizabeth I, who had not ruled over Scotland or any of the subsequent united kingdoms which it has entered into.

The Inner House of the Scottish Court of Session held that the monarch's title is the sole prerogative of the sovereign, and the Crown had accepted a system whereby regnal numbers were taken from the larger of both former kingdoms in the United Kingdom, that is England and not Scotland.

If a monarch rules more than one realm, he or she may carry different ordinals in each one, as they are each assigned chronologically, but some realms may have had different numbers of rulers of the same regnal name previously, usually from a different dynasty.

Their regnal numbers vary from source to source.

Because he was not a legitimate pope, the next three Pope Johns, John XVII, John XVIII and John XIX, took the regnal numbers XVI, XVII and XVIII, but some historians of the Middle Ages corrected their names including Antipope Philagathos among the Popes, and the wrongly corrected sequencing was never subsequently corrected.

The regnal numbers in England are a reference to her descent, as well as that of her uncle and father, from Henrietta ' Minette ' Stuart, Duchess of Orleans, youngest daughter of Charles I of England.

He was followed in 1390 by his ailing son John, who took the regnal name Robert III.

Máel Coluim mac Donnchada ( Modern Gaelic: Maol Chaluim mac Dhonnchaidh, called in most Anglicised regnal lists Malcolm III, and in later centuries nicknamed Canmore, " Big Head ", either literally or in reference to his leadership, " Long-neck "; died 13 November 1093 ), was King of Scots.

Artashata took the regnal name Darius III, and quickly demonstrated his independence from his assassin benefactor.

By coincidence, his regnal number ( III ) was the same for both Orange and England.

Commenting on the fact that Egyptologists have no problem in reconstructing history using inference of this sort, whereas critics will sometimes not allow the same historical method to be applied to the Bible, Young writes, " Do those who reject the Menahem / Pekah rivalry as improbable also reject as improbable this reconstruction from Egypt's Eighteenth Dynasty that Egyptologists use to explain the regnal dates of Thutmose III?

In 1931, King Zog of Albania made a rare foreign tour and visited Vienna in an unsuccessful attempt to repatriate the crown, presumably for a future coronation ( he considered giving himself the regnal name " Skanderbeg III ").

Coin of Yazdgerd III, Sakastan mint, Dated regnal year | RY 11.

The Zoroastrian religious calendar, which is still in use today, uses the regnal year of Yazdegerd III as its base year.

Constantine, son of Cuilén ( Mediaeval Gaelic: Causantín mac Cuiléin ; Modern Gaelic: Còiseam mac Chailein ), known in most modern regnal lists as Constantine III, ( before 971 – 997 ) was king of Scots from 995 to 997.

Although the second Frederick of Sicily, he chose to call himself " Frederick III " ( being one of the rare medieval monarchs who actually used a regnal number ) — presumably because only some fifty years before, his well-known and remembered great-grandfather had reigned Sicily and also used an official ordinal: Fridericus secundus, imperator etc ..

The only sovereign whose regnal year was used was Sancho III, making Ferdinand the first count of Castile not to recognise the suzerainty of the king of León.

Yazdegird III was the last monarch of the Sasanian dynasty, and since the custom at that time was to count regnal years since the monarch ascended the throne, the reckoning of years was continued, in the absence of a Zoroastrian monarch, under Islamic rule.

Following the death of Queen Mary from smallpox in 1694, William continued to reign as William III, with his regnal years continuing to date from 1688.

For instance, 123 of these commemorative scarabs record the large number of lions ( either 102 or 110 depending on the reading ) that Amenhotep III killed " with his own arrows " from his first regnal year up to his tenth year.

His son Amenemhet III began reigning after Senusret's 19th regnal year, which has been widely considered Senusret's highest attested date.

Tadukhipa's aunt Gilukhipa ( sister of Tushratta ) had married Pharaoh Amenhotep III in his 10th regnal year.

His adoption of the apostolic name of John XII was the third example of taking a regnal name upon elevation to the papal chair, the first being John II ( 533 – 535 ) and the second John III ( 561 – 574 ).

Shuttarna's daughter Kilu-Hepa ( sometimes spelled Gilukhepa ) was given to Amenhotep III in marriage to seal the alliance between the two royal houses in the Pharaoh's 10th regnal year, taking with her a great dowry.

The sum of the highest attested regnal dates for Osorkon II, Takelot I, Osorkon I, and Shoshenq I, added to 841 BC as year 1 of Shoshenq III, yields 938 BC at the latest for year 1 of Shoshenq I ...

To avoid these problems, John took the regnal name of Robert III, honouring his father and great-grandfather.

He died during the reign of Hatshepsut before Thutmose III assumed the throne in Hatshepsut's 22nd regnal year.

In approximately his 42nd regnal year, many years after his campaigns in the Levant had ended, Thutmose III instructed his artisans to inscribe his military exploits into the walls of Amun-Re's temple at Karnak.

She was crowned with the regnal name Te-ha ' apapa III in 1893, and was deposed when Huahine was annexed by the French in September 1895.

" Chronology is sometimes confused, and dates are given wrongly ", even for basic information such as the regnal dates of the kings of Jerusalem.

The only likely earlier sources from which these chroniclers could derive information are regnal lists.

David Dumville has suggested that his true regnal dates are 554-581.

David Dumville has suggested that Cerdic's true regnal dates are 538-554.

There are no records to show that he actually used any regnal number.

In this chronology, the regnal years of List A are used due to their wide usage.

The regnal years for this reign are:

The regnal years for this joint reign are:

The regnal years for this reign are:

The regnal years for this reign are:

The regnal years for this reign are:

The regnal years for this reign are:

English legal statutes are cited by parliamentary session labeled by the regnal year in which that session sat.

If there are two sessions within the same regnal year, they are differentiated by a " Statute " suffix ( e. g. 13 Charles II Stat. 1 is a different session than 13 Charles II Stat.

The events depicted in the tomb of Meryre II are dated to the second month of Akhenaten's regnal year 12.

Nefertiti disappears from view somewhat earlier ( around regnal year 14 ); the reasons for this are unclear and under scholarly debate ( see below ).

Critics allege that many of the supposed correlations of regnal durations are the product of the selective parsing and blending of the dates, events, and individuals mentioned in the original text .< ref >

These reforms are considered to be named after Pope Gregory VII ( 1073 – 85 ), though he personally denied this and claimed his reforms, like his regnal name, honored Gregory the Great.

The genealogies and regnal lists are unanimous in describing Sæberht as the son of Sledd, who may have been regarded as the founder of the East Saxon dynasty.

In the various extant traditional states of the West African nation of Nigeria, the regnal names of the titled monarchs, who are known locally as the traditional rulers, serve two very important functions within the monarchical system.

However, it appears that the many difficulties and contradictions in the regnal list are caused partly by the efforts of later scribes to demonstrate that each king on the list was descended from Cerdic ; thus Cædwalla ’ s genealogy must be treated with caution.

Three competing kin-groups are recognizable in the charters and regnal lists of the time: the C, Wig and B groups.