Kuldevtas are considered of utmost importance to the GSB's. Normally Saraswats believe in the concept of "Panchayatan" - worshipping 5 gods like form of Shiva, Vishnu, Durga, Surya and Ganapati. Some GSB Temples still maintain this concept, while others have a single deity instead of five. "Kuldev" or "kuldaivat" are the deities which a set of families primarily worship. Their temples are built and maintained by these families, also called "Mahajans" (or Kulavis) of their respective temple.
Many Kuldevs/Kuldevatas are situated in Goa. However, during the early Portuguese persecutions, many GSBs and Saraswats fled Goa along with their Kuldevs to nearby regions of Maharashtra, Karnataka, Mumbai, Gujarat, Punjab. Hence, besides Goa, there are many GSB Temples in Maharashtra (Konkan side like Malwan, Vengurla, Savantwadi, Kudal, Ratnagiri, etc.), Mumbai.