We compute the tail-of-tail contribution to the conservative dynamics of eccentric, nonspinning compact binaries to relative 1PN order and to $\mathcal{O}(e_t^{12})$. Using the 1PN quasi-Keplerian dynamics in harmonic coordinates, we derive the Delaunay-averaged Hamiltonian at 5.5PN and 6.5PN order and match it to the effective-one-body description, allowing us to determine the corresponding contributions to the nongeodesic EOB $Q$ potential through the $\mathcal{O}(p_r^{12})$, including the dependence on the symmetric mass ratio up to $\mathcal{O}({\nu }^2)$. The terms linear in the mass ratio reproduce the available first-order self-force results, while the quadratic terms provide qualitatively new eccentric second-order self-force predictions arising from the tail-of-tail terms. We independently rederive the averaged Hamiltonian using a Fourier-Bessel decomposition of the hereditary interaction. Applying the first law at fixed orbital frequencies, we recover known contributions to the first-order self-force redshift through $\mathcal{O}(e^{12})$ and obtain the complete tail-of-tail contribution to the second-order inverse redshift at 5.5PN and 6.5PN through $\mathcal{O}(e^{10})$. These results provide weak-field building blocks for future high-order EOB and second-order self-force developments.

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• Classical black holes
• General relativity
• General relativity equations & solutions
• Gravitation
• Gravitational wave sources
• Gravitational waves