Final answer:
Alexandria and Teotihuacan were both cities founded by unknown people that were larger at their height than imperial Rome. Alexandria, founded by Alexander the Great, had a population of one million and was known for its scientific research and literary studies. Teotihuacan, located near present-day Mexico City, had a population of about 200,000 and was a significant center of commerce and manufacturing.
Step-by-step explanation:
In terms of cities founded by unknown people that were larger at their height than imperial Rome, two notable examples are Alexandria and Teotihuacan.
Alexandria: Founded by Alexander the Great in 331 BCE, Alexandria was the capital of the Ptolemaic kingdom in Egypt. It had a population of one million people and was the largest Hellenistic city. The city was known for its scientific research, literary studies, and the famous Alexandrian Library.
b Located near present-day Mexico City, Teotihuacan emerged in the first millennium CE as the first large city-state in the Americas. At its height between 350 and 650 CE, it had a population of about 200,000, making it one of the largest cities in the world. It was a major center of commerce and manufacturing, controlling the market for high-quality obsidian.