  Let $\pi_1, \pi_2, \pi_3$ be three cuspidal automorphic representations for
the group ${\rm SL}(2, \Bbb{Z})$, where $\pi_1$ and $\pi_2$ are fixed and
$\pi_3$ has large conductor. We prove a subconvex bound for $L(1/2, \pi_1
\otimes \pi_2 \otimes \pi_3)$ of Weyl-type quality. Allowing $\pi_3$ to be an
Eisenstein series we also obtain a Weyl-type subconvex bound for $L(1/2 + it,
\pi_1 \otimes \pi_2)$.
