The Emperor Was delighted with Tulsidas and offered the Hanuman temple using an Islamic crescent Moon finial which adorns the temple spire. Additionally it is claimed that due to the crescent moon symbol over the spire, the temple wasn't wrecked through the Muslim rulers who invaded India at various instances. https://social4geek.com/story7664633/the-smart-trick-of-shri-hanuman-mandir-that-nobody-is-discussing