Final answer:
The City of Timgad was founded by Emperor Trajan and is known for its grid plan in Roman town planning.
Step-by-step explanation:
The City of Timgad, known for its grid plan in Roman town planning, was founded by Emperor Trajan. Trajan was the first in a line of adoptive emperors and is celebrated for his military successes in his wars against Dacia. The City of Timgad was one of the many Roman colonial cities that used the Hippodamian grid plan, which was based on straight streets that intersected at right angles to form regular city blocks.