Setting foundation for modern archaeology 

        Phraya Boranrajathanin is the pioneer in developing archaeological body of knowledge, techniques, and new methodology, as can be seen in his archaeological writings, initiatives, and activities. The principal archaeological works of Phraya Boranrajathanin are:

       1.1 The exploration and excavation of ancient palaces and temples of Ayutthaya, by the method of studying and analyzing historical and archaeological evidences to understand an ancient Ayutthaya city plan and the city history. The excavation led by Phraya Boranrajathanin was the first ever undertaken according to the modern archaeological methodology, in the area of Ayutthaya city. Phraya Boranrajathanin also recreated a plan for the ancient architectural style of the old buildings of Ayutthaya and renovated the city landscape. Indeed, his innovative archaeology and rigorous fieldwork have become model practice for the reservation works of Historic City of Ayutthaya until the present. 

1.2 The implementation of modern survey techniques in archaeological works. Phraya Boranrajathanin had conducted various surveys and mapped the Ayutthaya city landscape and ancient buildings. The map Phraya Boranrajathanin produced is considered the first ancient city map of Ayutthaya which was made in compliance with the historical and archaeological method and has become an indispensable source for Ayutthaya study. Phraya Boranrajathanin’s Ayutthaya city map has also been a crucial source for the Fine Arts Department in determining the boundary of the ancient city of Ayutthaya, listing it as a historical site, and establishing the site as the Historic City of Ayutthaya.

       1.3 The conservation of the Ayutthaya ancient city as the national heritage in accordance with the royal order of King Chulalongkorn. Phraya Boranrajathanin had made a pioneering plan and accordingly implemented it to delimit  the area of the Ayutthaya ancient city preventing it from being ransacked and destroyed. Not surprisingly, many of the archaeological evidences and ancient buildings have survived until today. Thus, the Historic City of Ayutthaya has become the national heritage learning site and has conformed to the UNESCO World Heritage selection criteria of bearing a unique testimony to a cultural tradition and even civilization.