Year 178 BC was a year of the pre-Julian Roman calendar

Roman calendar

The Roman calendar changed its form several times in the time between the founding of Rome and the fall of the Roman Empire. This article generally discusses the early Roman or pre-Julian calendars...

. At the time it was known as the Year of the Consulship of Brutus and Vulso (or, less frequently, year 576 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 178 BC 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 Republic

• In Rome, the praetor
  Praetor
  Praetor was a title granted by the government of Ancient Rome to men acting in one of two official capacities: the commander of an army, usually in the field, or the named commander before mustering the army; and an elected magistratus assigned varied duties...
  
   Lucius Postumius Albinus celebrates a triumph after conquering the Vaccaei and Lusitani during his time as Roman
  Roman Republic
  The Roman Republic was the period of the ancient Roman civilization where the government operated as a republic. It began with the overthrow of the Roman monarchy, traditionally dated around 508 BC, and its replacement by a government headed by two consuls, elected annually by the citizens and...
  
   commander in the province of Hispania Ulterior
  Hispania Ulterior
  During the Roman Republic, Hispania Ulterior was a region of Hispania roughly located in Baetica and in the Guadalquivir valley of modern Spain and extending to all of Lusitania and Gallaecia...
  
  .

Greece

• One of Perseus'
  Perseus of Macedon
  Perseus was the last king of the Antigonid dynasty, who ruled the successor state in Macedon created upon the death of Alexander the Great...
  
   first acts on becoming king of Macedon
  Macedon
  Macedonia or Macedon was an ancient kingdom, centered in the northeastern part of the Greek peninsula, bordered by Epirus to the west, Paeonia to the north, the region of Thrace to the east and Thessaly to the south....
  
  ia is to renew the treaty between Macedonia and Rome. In the mean time, Perseus builds up the Macedonian army and puts out feelers for creating an alliance with the Greek leagues, with his northern barbarian neighbours, and also with the Seleucid king Seleucus IV
  Seleucus IV Philopator
  Seleucus IV Philopator , ruler of the Hellenistic Seleucid Empire, reigned from 187 BC to 175 BC over a realm consisting of Syria , Mesopotamia, Babylonia and Nearer Iran . He was the second son and successor of Antiochus III the Great and Laodice III...
  
  .