Final answer:
The Pantheon in Rome is the oldest structure, completed in 126 CE, followed by the Arch of Constantine in Rome from 315 CE. Diocletian's Palace in Split came next, with Diocletian retiring there in 305 CE, and finally, the Hagia Sophia in Istanbul, which was completed in 537 CE.
Step-by-step explanation:
The order of the buildings from earliest to latest based on the historical context provided are as follows:
- Pantheon, Rome - Completed in 126 CE during the reign of Emperor Hadrian.
- Arch of Constantine, Rome - Inaugurated in 315 CE to commemorate Constantine I's victory at the Battle of Milvian Bridge in 312 CE.
- Palace of Diocletian, Split - Diocletian retired to his palace in 305 CE, suggesting its completion at or before this date.
- Hagia Sophia, Istanbul - Construction of the current structure started in 532 CE and was completed in 537 CE, thus it's the most recent among the listed structures.
This order reflects the chronological development of these significant historical monuments, each representing important architectural and cultural period.