The Constitution of Virginia is the primary source of authority for all Virginia state law. The first Virginia constitution was adopted in 1776. Since then, the state constitution has gone through a number of redraftings and revisions. The most recent general revision was ratified by Virginia voters in 1970 and became effective on July 1, 1971. The text of the current Virginia constitution can be most easily found in the first volume of the Code of Virginia, along with references to cases interpreting the constitution. The text is also available online.
For more detailed information on Virginia constitutional law and history, see Commentaries on the Constitution of Virginia, KFV2801 1970.A6 H68 or The Virginia State Constitution: A Reference Guide KFV2801 1970.A6 D56 2006.