[hugh4life]

There's a defunct auxlang project called Lingula that aimed to focus on comprehension between romance speakers.

https://www.reddit.com/r/Lingula/

I don't think an international auxiliary language besides english would ever be able to take hold, but I think something like Interlingua that just focused on romance languages and used a simplified romance grammar rather than simplifying it further would have been very interesting.

I think esperanto would have had a better shot had it adopted Zamenhof's early reform.

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

[ainar-g]

The best Romance IAL I've seen so far is Latino Sine Flexione[1]. As someone who knows Esperanto and some very basic French, it's really easy to understand.

[1]: https://en.wikipedia.org/wiki/Latino_sine_flexione

[aasasd]

Can't speak from my experience here, but others say if you know one Romance language, you begin to easily understand words in other ones. So I guess any one of them would work as an international language, but Castellano seems to have a large headstart.

[rodgerd]

I'm learning French (B1 level) and was surprised how much I could pick out of a Romanian movie (the tremendously enjoyable https://www.nziff.co.nz/2019/christchurch/the-whistlers/).