diff --git a/gtsam_unstable/nonlinear/ceres_autodiff.h b/gtsam/3rdparty/ceres/autodiff.h
similarity index 100%
rename from gtsam_unstable/nonlinear/ceres_autodiff.h
rename to gtsam/3rdparty/ceres/autodiff.h
diff --git a/gtsam_unstable/nonlinear/ceres_eigen.h b/gtsam/3rdparty/ceres/eigen.h
similarity index 100%
rename from gtsam_unstable/nonlinear/ceres_eigen.h
rename to gtsam/3rdparty/ceres/eigen.h
diff --git a/gtsam_unstable/nonlinear/ceres_example.h b/gtsam/3rdparty/ceres/example.h
similarity index 100%
rename from gtsam_unstable/nonlinear/ceres_example.h
rename to gtsam/3rdparty/ceres/example.h
diff --git a/gtsam_unstable/nonlinear/ceres_fixed_array.h b/gtsam/3rdparty/ceres/fixed_array.h
similarity index 100%
rename from gtsam_unstable/nonlinear/ceres_fixed_array.h
rename to gtsam/3rdparty/ceres/fixed_array.h
diff --git a/gtsam_unstable/nonlinear/ceres_fpclassify.h b/gtsam/3rdparty/ceres/fpclassify.h
similarity index 100%
rename from gtsam_unstable/nonlinear/ceres_fpclassify.h
rename to gtsam/3rdparty/ceres/fpclassify.h
diff --git a/gtsam_unstable/nonlinear/ceres_jet.h b/gtsam/3rdparty/ceres/jet.h
similarity index 100%
rename from gtsam_unstable/nonlinear/ceres_jet.h
rename to gtsam/3rdparty/ceres/jet.h
diff --git a/gtsam_unstable/nonlinear/ceres_macros.h b/gtsam/3rdparty/ceres/macros.h
similarity index 100%
rename from gtsam_unstable/nonlinear/ceres_macros.h
rename to gtsam/3rdparty/ceres/macros.h
diff --git a/gtsam_unstable/nonlinear/ceres_manual_constructor.h b/gtsam/3rdparty/ceres/manual_constructor.h
similarity index 100%
rename from gtsam_unstable/nonlinear/ceres_manual_constructor.h
rename to gtsam/3rdparty/ceres/manual_constructor.h
diff --git a/gtsam_unstable/nonlinear/ceres_rotation.h b/gtsam/3rdparty/ceres/rotation.h
similarity index 100%
rename from gtsam_unstable/nonlinear/ceres_rotation.h
rename to gtsam/3rdparty/ceres/rotation.h
diff --git a/gtsam_unstable/nonlinear/ceres_variadic_evaluate.h b/gtsam/3rdparty/ceres/variadic_evaluate.h
similarity index 100%
rename from gtsam_unstable/nonlinear/ceres_variadic_evaluate.h
rename to gtsam/3rdparty/ceres/variadic_evaluate.h