1 Chronicles 9

So all Israel was recorded by genealogies, and indeed, they were inscribed in the book of the kings of Israel. But Judah was carried away captive to Babylon because of their unfaithfulness.  And the first inhabitants who dwelt in their possessions in their cities were Israelites, priests, Levites, and the Nethinim. vv.1-2

Read chapter 9
These first two verses of the chapter can seem kind of confusing.  The first verse sums up all the genealogies of the previous chapters of the tribes of Israel and the second verse describes those that returned after their captivity.  So the names in this chapter are some of those that survived captivity and returned to Jerusalem.  The first inhabitants to return to their land from exile are Israelites, who here refer to the tribes of Judah, Benjamin, Ephraim and Manasseh as we see described in detail later in the chapter, as well as priests, Levities and Nethinim (Levities with special tasks in serving in the Tabernacle).  First Chronicles was obviously written after the captivity to record these names given here even though the book  is chronologically before the captivity.  Yet like I mentioned back in chapter six with the genealogy of Levi, it was very important for priests and Levites to prove their genealogy for there specific tasks, even more-so after the captivity when documents would have been destroyed or lost possibly.  How far back can you trace your genealogy?  Do you have a record kept?  What big events dramatically effected your genealogy (i.e. moving to a new country, wars, marriage of different races or cultures)?