Question: What was the first name of the person who recorded the size of the Brigantia territory in the 2nd century AD?

Context paragraphs:
Sanni: The Sanni (Georgian: სანები ) are mentioned by Strabo (1st century BC/1st century AD), Pliny the Elder (1st century AD) and Arrian (2nd century AD) as a people settling near Trebizond (in today's Turkish Black Sea Region).

Pharnavazid dynasty: The Pharnavazid, Pharnabazid or Parnavazianni (Georgian: ფარნავაზიანები, ფარნავაზიანნი ) is the name of the first dynasty of Georgian kings of Kartli (Iberia) preserved by "The Georgian Chronicles".  Their rule lasted, with intermissions, from the 3rd century BC to the 2nd century AD.  The main male line is reported to have become extinct early on and followed by houses related to it in the female line.  By the close of the 2nd century AD, the Pharnavazid rule came to an end and the Arsacid Dynasty took over the crown of Iberia.

Catacombs of Rome: The Catacombs of Rome (Italian: "Catacombe di Roma" ) are ancient catacombs, underground burial places under Rome, Italy, of which there are at least forty, some discovered only in recent decades.  Though most famous for Christian burials, either in separate catacombs or mixed together, people of all the Roman religions are buried in them, beginning in the 2nd century AD, mainly as a response to overcrowding and shortage of land.  The Etruscans, like many other European peoples, used to bury their dead in underground chambers.  The original Roman custom was cremation, after which the burnt remains were kept in a pot, ash-chest or urn, often in a columbarium.  From about the 2nd century AD, inhumation (burial of unburnt remains) became more fashionable, in graves or sarcophagi, often elaborately carved, for those who could afford them.  Christians also preferred burial to cremation because of their belief in bodily resurrection at the Second Coming.

Ptolemy: Claudius Ptolemy ( ; Greek: Κλαύδιος Πτολεμαῖος , "Klaúdios Ptolemaîos" ] ; Latin: "Claudius Ptolemaeus" ; c. 170 ) was a Greco-Roman mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology.  He lived in the city of Alexandria in the Roman province of Egypt, wrote in Koine Greek, and held Roman citizenship.  The 14th-century astronomer Theodore Meliteniotes gave his birthplace as the prominent Greek city Ptolemais Hermiou (Greek: Πτολεμαΐς ‘Ερμείου ) in the Thebaid (Greek: Θηβαΐδα [Θηβαΐς] ).  This attestation is quite late, however, and, according to Gerald Toomer, the translator of his "Almagest" into English, there is no reason to suppose he ever lived anywhere other than Alexandria.  He died there around AD 168.

Harpocration: Valerius Harpocration (Greek: Οὐαλέριος or Βαλέριος Ἁρποκρατίων , "gen".  Ἁρποκρατίωνος) was a Greek grammarian of Alexandria, probably working in the 2nd century AD.  He is possibly the Harpocration mentioned by Julius Capitolinus ("Life of Verus", 2) as the Greek tutor of Lucius Verus (2nd century AD); some authorities place him much later, on the ground that he borrowed from Athenaeus.  His "Lexicon of the Ten Orators" (Περὶ τῶν Λέξεων τῶν Δέκα Ῥητόρων, or briefly Λεξικὸν τῶν Δέκα Ῥητόρων), which has come down to us in an incomplete form, contains, in more or less alphabetical order, notes on well-known events and persons mentioned by the orators, and explanations of legal and commercial expressions.  As nearly all the lexicons to the Greek orators have been lost, Harpocration's work is especially valuable.  Amongst his authorities were the writers of Atthides (histories of Attica), the grammarian Didymus Chalcenterus, Dionysius of Halicarnassus, and the lexicographer Dionysius, son of Tryphon.  The book also contains contributions to the history of Attic oratory and Greek literature generally.  His "Collection of Florid Expressions", a sort of anthology or chrestomathy attributed to him by the "Suda", is lost, but elements of it survive in later lexica.  A series of articles in the margin of a Cambridge manuscript of the "Lexicon" forms the basis of the "Lexicon rhetoricum Cantabrigiense" by Peter Paul Dobree.

Brigantia (ancient region): Brigantia is the land inhabited by the Brigantes, a British Celtic tribe which occupied the largest territory in ancient Britain.  The territory of Brigantia which now forms Northern England and part of The Midlands covered the majority of the land between the River Tyne and the River Humber forming the largest Brythonic Kingdom in ancient Britain.  It was recorded by Ptolemy in the 2nd century AD to extend sea to sea, from the Irish sea on the west coast to the North sea in the east

Antiochus of Athens: Antiochus of Athens (Greek: Ἀντίοχος ὁ Ἀθηναῖος ) was an influential Hellenistic astrologer who flourished sometime between the late 1st and mid 2nd century AD.  There is some disagreement as to when he lived and wrote.  Franz Cumont and others have argued that he lived as early as the 1st century BC, while David Pingree placed him as late as the end of the 2nd century AD.  The one agreed datum is that Antiochus is referenced by Porphyry (234-c.  305 AD), and so Antiochus must have lived before the death of Porphyry.

Castra of Hoghiz: The castra of Hoghiz was a fort in the Roman province of Dacia.  The fort was built, in the 2nd century AD, on the left bank of the Olt River, at a place where a Dacian settlement existing already in the 2nd century BC was unearthed.  The fort and the nearby village were abandoned in the 3rd century AD.  The ruins of the castra are located in Hoghiz, Romania.

Kadia Dungar caves: Kadia Dungar Caves are located at Kadia Dungar near Zazpor village of Zagadiya Taluka of in Bharuch district of the Indian state of Gujarat.  The group has seven caves carved out in 1st and 2nd century AD on the mountain.  The group includes sculpture of monolithic lion pillars.  An architecture of cave shows vihara style construction.  The site has brick stupa at the foot of a mountain.  The caves were carved out in 1st or 2nd century AD.  influenced by Buddhist architecture.

Caspiane: Caspiane, or Kaspiane (Armenian: Կասպք "Kaspkʿ") was the land populated by the tribe of Caspians, after whom it received its name.  Originally a province of Medes in the 3rd-2nd centuries BC, the land of the Caspians was conquered by Armenians in the 2nd century BC, then passed to Caucasian Albania under Sassanid Persian suzerainty in the 5th century, and later became an independent state.  In the 2nd century AD, it became known as Paytakaran, and after 387 AD.  became a part of the larger region of Balasakan.

Supporting paragraphs: Brigantia (ancient region) Ptolemy
Answer: Claudius