* 217 – Roman Emperor Caracalla is assassinated ( and succeeded ) by his Praetorian Guard prefect, Marcus Opellius Macrinus.

The 212 edict of Emperor Caracalla which formally conferred Roman citizenship on all residents of Roman provinces, did not however exempt them from the poll tax.

This revolt spread to the entire Syrian army ( which, at the time, was swollen with troops raised by the Emperor Caracalla, and not fully loyal to Macrinus ), and eventually they were to win the short struggle that followed by defeating Macrinus at a battle just outside Antioch.

Emperor Caracalla

* April 8 – Caracalla, Roman Emperor ( assassinated ) ( b. 188 )

* April 4 – Lucius Septimius Bassianus ( Caracalla ), Roman Emperor ( d. 217 )

* Emperor Septimus Severus comes Britain with his sons Caracalla and Geta.

* Emperor Caracalla tricks the Parthians by accepting a marriage proposal.

Caracalla, of mixed Punic – Roman and Syrian descent, was born Lucius Septimius Bassianus in Lugdunum, Gaul ( now Lyon, France ), the son of the later Emperor Septimius Severus and Julia Domna.

Imperial Roman medallion with Olympias: part of a 3rd century series representing Emperor Caracalla as the descendant of Alexander the Great.

The Roman Emperor Caracalla ( 188 AD to 217 AD ) visited the shrine of ‘ the Celtic healing-god ’ Grannus during the war with Germany in about 215.

Geta (; 7 March 189 – 19 December 211 ), was a Roman Emperor co-ruling with his father Septimius Severus and his older brother Caracalla from 209 to his death.

The final coin belongs to Emperor Caracalla and came from the mint of Rome ( 206-210 CE ).

* Imperator Destinatus (" Destined to be Emperor "), heir apparent, used by Septimius Severus for Caracalla.

Around 215, it was named Colonia Aurelia Antoniana Ovilabis by Emperor Caracalla.

In 214 AD, the Roman Emperor Caracalla promoted the town to the status of a regional and administrative center with powers of adjudication ( conventus ).

The titles Antoniniana ( awarded by Caracalla or Elagabalus ), Gordiana ( by Gordian III ), Deciana ( by Decius ), Floriana ( by Florianus ), and Cariniana ( by Carinus ) were short-lived, however, and dropped after the death of the Emperor.

When the Emperor Caracalla sacked Alexandria ( 215 ) in punishment for their satire directed at him, Origen fled to Caesarea, where the bishops present requested that he give sermons.

* Publia Fulvia Plautilla, daughter of the above, Roman Empress and wife to Roman Emperor Caracalla.

A first indecisive campaign was led by Emperor Caracalla in 217, during which he was assassinated.

Empress and wife of Roman Emperor Lucius Septimius Severus and mother of Emperors Geta and Caracalla, Julia was among the most important women ever to exercise power behind the throne in the Roman Empire.

In 217 her cousin Emperor Caracalla was killed, and Macrinus ascended to the imperial throne.

Most probably, the origin is linked to Roman Emperor Caracalla, who supposedly established a fortress in the area.

The Baths of Caracalla () in Rome, Italy were Roman public baths, or thermae, built in Rome between AD 212 and 216, during the reign of the Emperor Caracalla.

Alexios III Angelos () ( c. 1153 – 1211 ) was Byzantine Emperor from 1195 to 1203.

Together with his father and brothers, Alexios had conspired against Emperor Andronikos I Komnenos ( c. 1183 ), and thus he spent several years in exile in Muslim courts, including that of Saladin.

February 1215: Yolanda de Courtenay ( c. 1200 – 1233 ), daughter of Peter I, Emperor of the Latin Empire and his second wife, Yolanda I, Empress of the Latin Empire

Andronikos I Komnenos ( or Andronicus I Comnenus, ; c. 1118 – September 12, 1185 ) was Byzantine Emperor from 1183 to 1185 ).

* Eirene Komnene ( born c. 1169 ), who was briefly married to Alexios Komnenos, a son of Emperor Manuel I Komnenos by Theodora Batatzina.

Constans () ( c. 323 – 350 ), was Roman Emperor from 337 to 350.

A bas-relief of a soldier and horse with saddle and stirrup s, from the tomb of Chinese Emperor Taizong of Tang ( r. 626-649 ), c. 650

* Conrad II, Holy Roman Emperor ( c. 990 – 1039 )

Diocletian (; c. 22 December 244 – 3 December 311 ), was a Roman Emperor from 284 to 305.

There is suspicion that Emperor Keitai ( c. 500 AD ) may have been an unrelated outsider, though the sources state that he was a male-line descendant of Emperor Ōjin.

Gallienus (; c. 218 – 268 ) was Roman Emperor with his father Valerian from 253 to 260, and alone from 260 to 268.

* Henry VII, Holy Roman Emperor ( c. 1275 – 1313 )

Heraclius (,, c. 575 – February 11, 641 ) was Byzantine Emperor from 610 to 641.

Image: Sun Quan Tang. jpg | Emperor Sun Quan in the Thirteen Emperors Scroll and Northern Qi Scholars Collating Classic Texts, by Yan Liben ( c. 600-673 AD ), Chinese

The Jin Dynasty practitioner and advocate of acupuncture and moxibustion, Huangfu Mi ( 215-282 ), also quotes the Yellow Emperor in his Jiayi jing, c. 265.

Josephus wrote all of his surviving works after his establishment in Rome ( c. AD 71 ) under the patronage of the Flavian Emperor Vespasian.

Justinian I () (, ) ( c. 482 – 14 November 565 ), commonly known as Justinian the Great, was Byzantine Emperor from 527 to 565.

Leo III the Isaurian also known as the Syrian ( Greek: Λέων Γ ΄, Leōn III ), ( c. 685 – 18 June 741 ) was Byzantine Emperor from 717 until his death in 741.

Otto II, Holy Roman Emperor, from Registrum Gregorii, c. 983

Pope Gregory V, né Bruno of Carinthia ( c. 972 – 18 February 999 ) was Pope from 3 May 996 to 18 February 999, a son of the Salian Otto I, Duke of Carinthia, who was a grandson of the Emperor Otto I the Great.

Anastasius I (, ; c. 430 – July 518 ) was Byzantine Emperor from 491 to 518.

According to his The New York Times obituary published on April 3, 1872, Morse received respectively the decoration of the Atiq Nishan-i-Iftikhar ( English: Order of Glory ) medal on wearer's right depicted in photo of Morse with medals, set in diamonds, from the Sultan Ahmad I ibn Mustafa of Turkey ( c. 1847 ), a golden snuff box containing the Prussian gold medal for scientific merit from the King of Prussia ( 1851 ); the Great Gold Medal of Arts and Sciences from the King of Württemberg ( 1852 ); and the Great Golden Medal of Science and Arts from Emperor of Austria ( 1855 ); a cross of Chevalier in the Légion d ' honneur from the Emperor of France ; the Cross of a Knight of the Order of the Dannebrog from the King of Denmark ( 1856 ); the Cross of Knight Commander of the Order of Isabella the Catholic, from the Queen of Spain, besides being elected member of innumerable scientific and art societies in this States and other countries.