The creator himself who is the destructor of all the evil in the world. Yes, we are talking about the Mahadeva or Lord Shiva. The god with divine power is one of the creators of this world. Everything on his body symbolises some or the other things like:
His hair symbolises unison of mind, his Trishul symbolises control of mind, his meditative pose symbolises calmness, his serpent symbolises letting go of your ego. 
There have been several mythological studies of testimony and verses which narrate different stories about Lord Shiva's existence. Surprisingly, each one of them has something else in the store for us. 
So let's see everything one by one and consider the possibilities that could happen before we came.

Do you know about the father of Lord Shiva?
We know that after reading the title you must have got curious to know who is the father of Lord Shiva. Well, there is a basic knowledge, and it states that Lord Shiva had no parents.  

Then, how was he born? 
He is regarded as Anaadi. This word literally means that the world is without a start or an end. If he is Anaadi, he did not have a start. He is beyond birth and death.

If an article based on this topic is to be believed...
Once upon a time, a saint asked Lord Shiva, "Who is your father?", to which he replied, "Lord Brahma is my father." 

When Shiva was further questioned about his grandfather... 
He replied, "Lord Vishnu is my grandfather."

Again, when Shiva was asked about his great-grandfather...
He replied that he is his own great-grandfather.  

There is another interesting story associated with this...
Lord Brahma and Lord Vishnu were once arguing about the fact that who is more powerful. Suddenly, a blazing pillar of light appeared. The pillar extended towards the end of the world. Stretching from horizon to horizon. Both the Lords couldn't find the start or the end of the pillar, and this made them difficult. And suddenly, Lord Shiva emerged from the pillar. 
This proves that he has no start or end when it comes to his existence or birth.   

He is everywhere, and he has no singular existence.   
Since all these facts are mythological, it is said that they can be a part of a poetry or maybe a myth. But, many people also believe that Lord Shiva has been given various names, and he heeds to all his devotees when they call him. This shows that he is everywhere and he has no singular existence.