[arethuza]

The list of purpose built national capitals is actually pretty interesting:

https://en.wikipedia.org/wiki/List_of_purpose-built_national...

Constantinople lasted over 1100 years.... and Washington seems to be the capital of a reasonably prosperous and stable country?

[v77]

Ottawa, Canada wasn't purpose-built but was an insignificant city meant to be a neutral choice of capital between Anglo and Francophone Canada. This has also worked fine.

[cafard]

Byzantium was a city for centuries before Constantine was born, and a fine place to control the grain trade from the Black Sea.

[arethuza]

There was a city there but it wasn't that large and was dramatically redeveloped after it became the new capital:

https://www.thegreatcoursesdaily.com/making-constantinople/

[danjac]

Not to mention being closer to the Silk Road trade routes through Asia.

[raverbashing]

Interesting list

Both the Canadian and American cases are not a relocation that made it too far from the original place

[fakedang]

Constantinople was a major port way before Byzantine times. Calling it a purpose built capital is a joke. It was a purpose-assigned capital though.