Why we do say #GanpatiBappaMorya ?

Morya Gosavi (14th c) was a popular saint and most famous devotee of Bhagwan Ganesha. Morya is believed to have been born due to the grace of Ganesha, in order to spread the importance of Ganesha among the masses.
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Numerous legends recall his life. Morya became devoted to Ganesha when he started visiting the Morgaon temple of Ganesha. It is believed that due to the hindrance in Morya's services to the god in the popular Ganesha shrine,

Ganesha told Morya that he would appear in Chinchwad for Morya to worship, so Morya moved from Morgaon to Chinchwad, where Morya built a Ganesha temple. Consequently, Morya took sanjeevan samadhi by burying himself alive in his tomb.

Morya Gosavi is considered the chief spiritual progenitor and the most important saint of the Ganapatya - the Hindu sect centred on Ganesha worship - tradition and has been described as the "most famous devotee" of Ganesha.