The founding principle of geopolitics is that place -- geography -- plays a significant role in determining how nations will behave. If that theory is true, then there ought to be a deep continuity in a nation's foreign policy. Israel is a laboratory for this theory, since it has existed in three different manifestations in roughly the same place, twice in antiquity and once in modernity. If geopolitics is correct, then Israeli foreign policy, independent of policymakers, technology or the identity of neighbors, ought to have important common features. This is, therefore, a discussion of common principles in Israeli foreign policy over nearly 3,000 years.