Joachim Grassi was an Austrian architect of Italian descent who worked for the Siamese government in the late nineteenth century. He was among the first European architects employed by King Chulalongkorn, and contributed extensively to Siam 's architecture, especially the Neo-Classic, during the time of its modernization.

The Embassy of Portugal in Bangkok is the diplomatic mission of Portugal in Thailand. It is located in Bang Rak District, on the eastern bank of the Chao Phraya River, and is served by Soi Charoen Krung 30. Dating to 1820, with the ambassador's residence built in 1860, it is the oldest diplomatic mission in Thailand, and the ambassador's residence has been recognized as an award-winning historic building.