To clarify for clarity's sake, you do mean AD not BC correct? While there was a Tang Dynasty in 784 AD there certainly was not one in 784 BC. I just ask in case it's indeed 784 BC you're wondering about.

What is your age, ethnicity, gender, religion, social class, education, etc? What languages do you speak? How much do you know about the period?

We really need more information about you to be able to answer this.