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To help illustrate, here is a list of chronological years, with 1 BCE near the middle. There is no year zero:5 BCE (or BC)4 BCE3 BCE2 BCE1 BCE1 CE (or AD)2 CE3 CE4 CE5 CE
1 CE was exactly 2,009 years ago. The year preceding that was the year 1 BCE.
It is: 99 BC
The last date of BC was 1 BC, then the first date of AD was 1 AD, there was no zero.
1500 bc came before 753 bc. Year numbers go down in "bc", where the next year has a lower number than the previous year all the way to 1 bc. The year after 1 bc is 1 ad. To give an example, a tree that sprouted in 1500 bc would be about 753 years older by 753 bc and about 1500 years older by year 1 bc. On 1 ad, it would be 1501 years old.