Year 121 was a common year starting on Tuesday

Common year starting on Tuesday

This is the calendar for any common year starting on Tuesday, January 1 . Examples: Gregorian years 1985, 1991, 2002, 2013 and 2019or Julian year 1919 .MillenniumCenturyGregorian Year2nd Millennium:...

 (link will display the full calendar) of the Julian calendar

Julian calendar

The Julian calendar began in 45 BC as a reform of the Roman calendar by Julius Caesar. It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year .The Julian calendar has a regular year of 365 days divided into 12 months...

. At the time, it was known as the Year of the Consulship of Verus and Augur (or, less frequently, year 874 Ab urbe condita

Ab urbe condita

Ab urbe condita is Latin for "from the founding of the City ", traditionally set in 753 BC. AUC is a year-numbering system used by some ancient Roman historians to identify particular Roman years...

). The denomination 121 for this year has been used since the early medieval period, when the Anno Domini

Anno Domini

and Before Christ are designations used to label or number years used with the Julian and Gregorian calendars....

 calendar era

Calendar era

A calendar era is the year numbering system used by a calendar. For example, the Gregorian calendar numbers its years in the Western Christian era . The instant, date, or year from which time is marked is called the epoch of the era...

 became the prevalent method in Europe for naming years.

• Roman settlement in present-day Wiesbaden
  Wiesbaden
  Wiesbaden is a city in southwest Germany and the capital of the federal state of Hesse. It has about 275,400 inhabitants, plus approximately 10,000 United States citizens...
  
  , Germany
  Germany
  Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...
  
   is first mentioned.
• Emperor Hadrian
  Hadrian
  Hadrian , was Roman Emperor from 117 to 138. He is best known for building Hadrian's Wall, which marked the northern limit of Roman Britain. In Rome, he re-built the Pantheon and constructed the Temple of Venus and Roma. In addition to being emperor, Hadrian was a humanist and was philhellene in...
  
   fixes the border between Roman Britain
  Roman Britain
  Roman Britain was the part of the island of Great Britain controlled by the Roman Empire from AD 43 until ca. AD 410.The Romans referred to the imperial province as Britannia, which eventually comprised all of the island of Great Britain south of the fluid frontier with Caledonia...
  
   and Caledonia
  Caledonia
  Caledonia is the Latinised form and name given by the Romans to the land in today's Scotland north of their province of Britannia, beyond the frontier of their empire...
  
   on a line running from the River Tyne
  River Tyne
  The River Tyne is a river in North East England in Great Britain. It is formed by the confluence of two rivers: the North Tyne and the South Tyne. These two rivers converge at Warden Rock near Hexham in Northumberland at a place dubbed 'The Meeting of the Waters'.The North Tyne rises on the...
  
   to the Solway Firth
  Solway Firth
  The Solway Firth is a firth that forms part of the border between England and Scotland, between Cumbria and Dumfries and Galloway. It stretches from St Bees Head, just south of Whitehaven in Cumbria, to the Mull of Galloway, on the western end of Dumfries and Galloway. The Isle of Man is also very...
  
  .
• Construction of the Temple of Venus and Roma
  Temple of Venus and Roma
  The Temple of Venus and of Rome — in Latin, Templum Veneris et Romae — is thought to have been the largest temple in Ancient Rome. Located on the Velian Hill, between the eastern edge of the Forum Romanum and the Colosseum, it was dedicated to the goddesses Venus Felix and Roma Aeterna...
  
   begins in Rome
  Ancient Rome
  Ancient Rome was a thriving civilization that grew on the Italian Peninsula as early as the 8th century BC. Located along the Mediterranean Sea and centered on the city of Rome, it expanded to one of the largest empires in the ancient world....
  
  .

• Era name changes from Yongning (2nd year) to Jianguang in the Chinese Eastern Han Dynasty
  Han Dynasty
  The Han Dynasty was the second imperial dynasty of China, preceded by the Qin Dynasty and succeeded by the Three Kingdoms . It was founded by the rebel leader Liu Bang, known posthumously as Emperor Gaozu of Han. It was briefly interrupted by the Xin Dynasty of the former regent Wang Mang...
  
  .

• April 26 – Marcus Annius Verus, later the Roman Emperor Marcus Aurelius (d.