Subcategories - Empires, Dynasties
- Abahai
- Abdelkader
- Abenaki Wars
- Abu Klea
- Adam de la Halle
- Adrian IV
- Advances Are Made in Chinese Agricultural Technology
- Aetius
- Agrippina the Younger
- Ahmed Ben Bella
- Akbar
- Akiba ben Joseph
- Alani Gain Power
- Alaric
- Albanian Chieftains Are United Under Skanderbeg
- Albanian-Turkish Wars
- Alboin
- Albrecht Wenzel von Wallenstein
- Aleksandr Vasilyevich Suvorov
- Alexander III
- Alexander the Great
- Alexander the Great Begins Expansion of Macedonia
- Alexander the Great Invades the Indian Subcontinent
- Alexander’s Wars of Conquest
- Alexius I Comnenus
- Alfred Deakin
- Almoravid Empire
- Alp Arslan
- American Revolution
- Amritsar Massacre
- Ancient Warfare
- Andrea Orcagna
- Andrea Pisano
- Annie Besant
- Anthony Wayne
- Antigonus I Monophthalmos
- Antiochus the Great
- Antonia Minor
- Arabi Pasha
- Ardashīr I Establishes the Sāsānian Empire
- Aretaeus of Cappadocia
- Armenian Empire Reaches Its Peak Under Tigranes the Great
- Armenian Genocide
- Armenian Massacres
- Armenians Suffer Genocide During World War I
- Arminius
- Arnolfo di Cambio
- Árpád
- Arria the Elder
- Arria the Younger