1755 earthquake (and tsunami) nearly destroyed the whole city and was probably one of the most deadliest in history. It was also one of the first quakes to be studied scientifically [0]

Sooner or later it will hit Lisbon again, scientists say. As a Portuguese I'm very afraid the city is not prepared for something with an estimated magnitude of 7.7–9.0...

[0] https://en.wikipedia.org/wiki/1755_Lisbon_earthquake

I was wondering, given that quake, do Portugal's building codes now incorporate seismic standards?

Yes but since 2020 it's moving to European construction standards [0]

[0] https://en.wikipedia.org/wiki/Eurocode_8:_Design_of_structur...

The reconstruction of the city involved some of the first intentionally anti-seismic building methods.

https://en.wikipedia.org/wiki/Pombaline_style

It did destroy a significant portion of the city, and the rebuilding was a centerpoint of the Marquis de Pombal, whose expanding rule/influence was largely won based on his skill at using the rebuild to enact all manner of political change in a short period of time.

1755, and it really did obliterate the city. They had to rebuild it all, it was all gone.