When was IoTeX launched?

Could you elaborate on the timeline of IoTeX's inception? Specifically, I'm interested in knowing when the initial concept for IoTeX was formulated, and subsequently, when the project was officially launched. Understanding this key timeline can provide insight into the maturity and development progress of the platform. Additionally, it would be valuable to know if there were any significant milestones or achievements reached during the early stages of IoTeX's journey that helped shape its current position in the cryptocurrency and finance landscape.