Premise: The Sala del Mappamondo (named after a lost map of the Sienese world painted by Ambrogio Lorenzetti to trace the city's international banking interests) has two great frescoes by the Siena-born master Simone Martini.

Hypothesis: There are two frescoes by Simone Martini located in the Sala del Mappamondo.
Relation: entailment