I will consider Maass forms transforming with respect to (unitary

characters of) unit groups of orders of an indefinite quaternion

division algebra over Q. I will assume that these Maass forms are

eigenfunctions of the Hecke operators at almost all primes not

dividing the level (or equivalently, that they generate an irreducible

automorphic representation). However, I will not make any assumptions

about the local components of these Maass forms at the primes dividing

the level (in particular they do not need to be newforms). I will

present an upper bound for the sup-norm of such Maass forms in the

level aspect that is valid for general orders and improves upon the

trivial bound. The key element in the proof is a uniform counting

result for points in quaternionic lattices.

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