Who is on the $1000 dollar bill?

I'm curious, who exactly is featured on the hypothetical $1000 dollar bill? It's not a denomination that's currently in circulation, so I'm intrigued to know if there's a specific historical figure or notable individual that's been proposed for such a high-value bill. I understand that the design and choice of individual can be quite symbolic and representative of a country's values and history. So, who would you say is the most likely candidate, or has there even been any serious discussion or proposals surrounding this topic?