The Antigonid dynasty was a royal family that ruled over parts of ancient Greece and Macedonia after the death of Alexander the Great in 323 BCE. Founded by Antigonus I Monophthalmus, the dynasty emerged from the conflicts known as the Diadochi, where Alexander's generals fought for control of his vast empire. The Antigonids established their power primarily in Macedonia and sought to maintain control over the Greek city-states. The dynasty is best known for its significant rulers, including Demetrius I and Antigonus II Gonatas. The Antigonids faced challenges from rival dynasties, such as the Ptolemaic dynasty in Egypt and the Seleucid Empire in the east. Their rule lasted until the Roman conquest of Macedonia in 168 BCE, marking the end of their influence in the region.