Mainland Greece in the context of "Expansion of Macedonia under Philip II"

Greece in the Roman era (Greek: Έλλάς, Latin: Graecia) describes the period of ancient Greece (roughly, the territory of the modern nation-state of Greece) as well as that of the Greek people and the areas they inhabited and ruled historically, from the Roman Republic's conquest of mainland Greece in 146 BC until the division of the Roman Empire in late antiquity. It covers the periods when Greece was dominated first by the Roman Republic and then by the Roman Empire.

In the history of Greece, the Roman era began with the Corinthian defeat in the Battle of Corinth in 146 BC. However, before the Achaean War, the Roman Republic had been steadily gaining control of mainland Greece by defeating the Kingdom of Macedon in a series of conflicts known as the Macedonian Wars. The Fourth Macedonian War ended at the Battle of Pydna in 148 BC with the defeat of the Macedonian royal pretender Andriscus.

Under the reign of Philip II (359–336 BC), the ancient kingdom of Macedonia, initially at the periphery of classical Greek affairs, came to dominate Ancient Greece in the span of less than 25 years, largely thanks to the character and policies of its king. In addition to utilising effective diplomacy and marriage alliances to achieve his political aims, Philip II was responsible for reforming the ancient Macedonian army into an effective fighting force. The Macedonian phalanx became the hallmark of the Macedonian army during his reign and the subsequent Hellenistic period. His army and engineers also made extensive use of siege engines. Chief among Philip's Thracian enemies was the ruler Kersebleptes, who may have coordinated a temporary alliance with Athens. In a series of campaigns stretching from 356 to 340 BC, Philip II managed to ultimately subjugate Kersebleptes as a tributary vassal, conquering much of Thrace in the process. Philip II also fought against the Illyrian king Bardylis, who threatened Macedonia proper, and against Grabos II and Pleuratus in Illyria (centred in modern-day Albania). In his newly conquered territories, he founded new cities such as Philippi, Philippopolis (modern Plovdiv, Bulgaria), Herakleia Sintike (Pirin Macedonia, Bulgaria), and Herakleia Lynkestis (modern Bitola, North Macedonia).

Philip II eventually campaigned against the city-state of Athens and her allies in the Aegean region, as well as Thebes after the decline of its hegemony in mainland Greece. In the defence of the Amphictyonic League of Delphi and in conjunction with the Thessalian League, Macedonia became a key player in the Third Sacred War (356–346 BC), defeating the Phocians, commanded by Onomarchus, at the Battle of Crocus Field in 352 BC. While poised to launch a direct assault on Athens in 346 BC, the Macedonian king was met with an Athenian embassy that arranged the Peace of Philocrates. As a result, Macedonia and Athens became allies, yet Athens was forced to relinquish its claims to the city of Amphipolis (in modern-day Central Macedonia).

The Euripus Strait (Greek: Εύριπος [ˈevripos]) is a narrow channel of water separating the Greek island of Euboea in the Aegean Sea from Boeotia in mainland Greece. The strait's principal port is Chalcis on Euboea, located at the strait's narrowest point.

The strait is subject to strong tidal currents which reverse direction approximately four times a day. Tidal flows are very weak in the Eastern Mediterranean, but the strait is a remarkable exception. Water flow peaks at about 12 kilometres per hour (7.5 mph; 6.5 kn), either northwards or southwards, and lesser vessels are often incapable of sailing against it. When nearing flow reversal, sailing is even more precarious because of vortex formation.

The 74 regional units of Greece are the country's third-level administrative units (counting decentralized administrations as first-level). They are subdivisions of the country's 13 regions, and are further divided into municipalities.

They were introduced as part of the Kallikratis administrative reform on 1 January 2011 and are comparable in area and, on the mainland, coterminous with the "pre-Kallikratis" prefectures of Greece.

The Battle of Pydna was fought in 148 BC between Rome and the forces of the Macedonian leader Andriscus. The Roman force was led by Quintus Caecilius Metellus, and was victorious. The battle played an important role in deciding the outcome of the Fourth Macedonian War, and saw the annihilation of the last military-political force of Macedon.

The war had begun when the pretender Andriscus defeated Rome's clients in Macedon and crowned himself king, defeating a Roman force sent to stop him and invading parts of Greece. The senate then sent Quintus Caecilius Metellus with another, larger army to stop the pretender; the Roman commander chose to undertake both a land and sea offensive, forcing Andriscus to take a defensive position near Pydna, where Metellus engaged and soundly defeated him.

Helladic chronology is a relative dating system used in archaeology and art history. It complements the Minoan chronology scheme devised by Sir Arthur Evans for the categorisation of Bronze Age artefacts from the Minoan civilization within a historical framework. Whereas Minoan chronology is specific to Crete, the cultural and geographical scope of Helladic chronology is confined to mainland Greece during the same timespan (c. 3200 – c. 1050 BC). Similarly, a Cycladic chronology system is used for artifacts found in the Aegean islands. Archaeological evidence shows that civilization developed at the same time across the region, so the three schemes align chronologically. They are grouped together as "Aegean" in terms such as Aegean art and, rather more controversially, Aegean civilization.

The systems derive primarily from changes in the style of pottery, which is a benchmark for relative dating of associated artifacts such as tools and weapons. On the basis of style and technique, Evans divided his Cretan Bronze Age pottery finds into three main periods which he called Early, Middle and Late Minoan. These were sub-divided into phases and some of those into sub-phases. The Helladic and Cycladic schemes were devised later and have similar sub-divisions. Evans' system has stood the test of time remarkably well but his labels do not provide firm dates because change is never constant and some styles were retained in use much longer than others. In fact it is partly this lack of dates that has been the strength of Evans's system; several of the dates Evans believed have certainly changed, and others remain under discussion, though within fairly narrow ranges, but the scheme just adjusts for such changes. Some pottery can be dated with reasonable precision by reference to Egyptian artifacts whose dates are more certain.