I am a famous ship, known for a tragic end, but I was once the pride of my nation and the first of my kind. What am I?

1. My design was considered revolutionary for my time, with an innovative hull and a complex system of watertight compartments.
2. I was built in Belfast, a city renowned for shipbuilding, and launched with great fanfare.
3. My maiden voyage was also my last, as I encountered a fateful event in the North Atlantic.
4. My sinking was a catalyst for changes in maritime safety regulations, including the requirements for lifeboats.