The Shiva Temple, popularly known as the Ernakulathappan Temple, facing the Rajendra Maidan, is an important place of worship in the mainland of Ernakulam. The name of the city is believed to have been derived from the temple.
The idol of Lord Shiva, the main deity, faces west, towards the sea. The temple also houses Shiva and Parvathy idols in kiratha forms. These idols are said to be swayambhoo (self-created). The annual festival falls in January- February. In connection with this, a cultural fest is also held.