Tirumala means the place of many hills.
In ancient days Tirumala was called as " Tiru vEnkatAdri ".
Sri Venkateswara (Lord Balaji) is the world famous Hindu God.
Venkatadri is the residence of him.
" VEm" is the symbol of all sins."Kata" means, burn them. Venkatadri means the place which burns all sins of people.

" Tolkapsiyam " is the first Tamil Literature.  In this book, Writer called swamy's land as Vengadam.
Poet " Mamulanar" also said the same. So at that time, TIrumala's name was VEngaDam.
People called Swamy as " Sri Venkatachalapati ", after only 935 A.D. .

There are so many stories about the god of Seven Hills. Most of them have no historical evidence.
According to some historic evidence, experts are telling like this...

Time: 100 B.C. - 100 A.D.
That was the deepest jungle. Some villagers came to that place in the search of their Cows.
They found Swamy Statue There in an Anthill. They surprised a lot .  
Who makes that statue? From when it is there! What God is he! .. nobody knows until now.
They told about this to their king , Tondaman.
He is the son of Nagarani and Karikalachola, the first Emperor of Chola dynasty , who ruled tanjavUr.
He builds Tonda manDal , so .. He was called as Tondaman king.
He went with very much of interest and saw the great Statue of Swamy. Statue is very big and tremendous. He admired a lot. After some days, he builds the first temple for Swamy. It was a temporary temple. It might be a rock construction with a small compound wall and without top or a partial top. We can imagine like this way .. Because Shilappadikaram of 760 A.D., said that swamy's statue is always contacting with the rays of sun and moon. We can imagine in another way also. Tondaman King constructed a small temple with a top, but it was destroyed, so sun and moon could see the god directly.
Finally, we can say that our grand fathers saw the Balaji, first time at the time of Karikala chola (100B.C. -100 A.D. )

Sri Venkateswara Swamy  is " Swayambhuvu". It means he has born himself in Tirumala. Swamy is on the hill top. In the ancient Tamil literature " ShilappadikAra" (756 A.D.) , Swamy was described as the god, who residing on the hill top of Venkatachala hill. So Swamy was called as " ucciyil NinRAn", means God on the hilltop. After some time, people recognized that Swamy's temple is in a lower height than the premises. So people started to call swamy as " Malai kuniya ninRAn".

Narayanadri's height is 3,620 feet. This is the tallest Hill in Seven Hills .

" Pancharatra" and " Vaikhanasa" are the two Agamas which tell the Temple procedures. Tirumala temple follows the Vaikhanasa Agama.

Now ," TiruchanUr" or "AlimElu MangApuram" is a famous town near Tirupati. That is in a distance of ten miles to Tirumala. That is very ancient and has a great history. Its old name is "TirushukhanUr". Before the establishment of Tirupati, TirushukanUr is the key place to Tirumala .
"Tiruvilan koil" was constructed in tirusukhanur in 826 A.D. It was also a  Venkateswara Temple.
Many people visited the tirusukhanUr and saw the god in Tiruvilan koil and returned to their villages. Because reaching Tirumala is a big risky journey in those days. There were no clear routes , no facilities and no safety. Due to this reason, Tiruvilan koil was closed at 960 A.D..
From the times of " pallava' and "chola", there was a village committee in tirushukanUr. That committee had maintained all the things of Tirumala temple. After the establishment of Tirupati, people who were working in Tirumala, shifted to Tirupati from tirusukhanUr. After that Tirupati developed gradually, TirushukanUr lost all.

Before 1200 A.D. , there was a small Village under the Seven Hills. That was called as  ' KottUru ' .  Ramanujacharya built a new town in the place of Village. Now we are calling that town as " Tirupati" . There was a Temple of " ParthasAradhi swamy". That  was small and ancient. At that time, the emperor of Chola dynasty was an opponent of " Vaishnava".  He ordered about Govindaraja swamy of chidambaram," Mahavishnu's residence is Sea. So throw him into the Sea ". Followers of ramanujacharya saved that Statue and brought to Tirupati. Ramanujacarya consecrated that Govindaraja Swamy in the Parthasaradhi Swamy Temple. Now we are calling that temple as " Govindaraja Swamy Temple".

Now Tirumala god is the No .1 earning God in the world. Hindus are describing him as " The God of Kaliyuga".