Early on, Germans were active in Siam and reported on the country and its conditions, for example in the 17th century Engelbert Kaempfer and Johann Jakob Merklein.

And already in 1678 a certain Johann Janßen Strauß wrote about "Ayudhya" and portrayed the king as one of the richest men in the world.

However, the first ambassador of a German state, Friedrich zu Eulenburg for the Kingdom of Prussia, arrived in Bangkok only in 1861 and concluded a treaty of friendship with Siam in 1862.

No suitable candidate could be found from the Thai side for an ambassadorial post in Germany, so King Mongkut asked John Bowring to serve as Siamese ambassador.

[2] Towards the end of the 19th century, German companies exerted a great influence on Siam's economic life and conquered important areas of the country's infrastructure development: Construction of the telegraph network, development of ports and the country's railroads and railroads.