Final answer:
The Celts were present in Britain before the Anglo-Saxons, who came after the Roman departure around 400 CE. The Tudor period followed much later, starting in 1485. Hence, the Celts were the earliest of the three groups mentioned.
Step-by-step explanation:
Ancient Peoples of England: Saxons, Celts, and Tudors
In the chronological timeline of English history, the Celts were present in Britain during the Iron Age and before the Roman conquest. Following the Roman withdrawal around 400 CE, the political vacuum led to invasions by Germanic tribes, most notably the Anglo-Saxons, which included the Angles and the Saxons from areas that are modern-day northern Germany and Denmark. The Anglo-Saxon period in England lasted until the Norman Conquest in 1066. Finally, the Tudors ruled England from 1485 to 1603, marking the end of the medieval period and the beginning of the era of Renaissance and exploration.
The Celts were among the earliest known occupants of the British Isles, with their presence well established before the Roman invasion. After the Romans departed, the Saxons, along with other Germanic tribes, settled and eventually governed the region, with their influence permeating through the culture and even the English language. The Tudors, though further down the line, represent a later and very different period, influenced by ideas of the Renaissance, the Reformation, and early modern statehood.
Therefore, to answer the student's question, the Celts were present in Britain first, followed by the Anglo-Saxons, and much later on, by the Tudors. It is essential to understand these periods as stepping stones that have significantly shaped the cultural and political landscape of modern-day England.