Indra is the god of rain and thunder, and the weather is at his command supplying rains in the universe. As controller of the megha (cloud), he is master of the clouds and is also known as Maghavan.
While Indra is the chief demigod of the heavenly planets, he is an ordinary living entity in the material world and possesses the four defects of the conditioned soul. King Indra is described as bhagavan, which is generally used in reference to the Supreme Personality of Godhead. King Indra is addressed as bhagavan because he has so much power in his hands.
Indra is the deity presiding over the hands. When the two hands of the universal form of the Lord became manifested, with them came the power of grasping and dropping things, and after that Indra appeared. Indra is known as Vajra-dhara, the carrier of the thunderbolt (vajra), his favorite weapon.
King Indra is also known as sata-kratu, which indicates that he has performed one hundred horse sacrifices (asvamedha-yajna). One who desires powerful sex should worship Indra. Also called Sacipati, the King of heaven is an incarnation of the lusty feature of the Lord. He is also called Sahasraksa.
On Manasottara Mountain are the abodes of four demigods. East of Sumeru Mountain is Devadhani, where King Indra lives, and south of Sumeru is Samyamani, the abode of Yamaraja, the superintendent of death. Similarly, west of Sumeru is Nimlocani, the abode of Varuna, the demigod who controls the water, and north of Sumeru is Vibhavari, where the demigod of the moon lives.
As the demigod in charge of the eastern side of the universe, where the heavenly planet, or paradise is situated, Indra as known as the ruler of Svargaloka. The planet in which Indra reigns is called Indraloka.
Indra was begot of the sage Kashyapa and his wife Aditi. Aditi had twelve sons, of whom Indra was the eleventh. Indra's wife was named Paulomi (Sacidevi). She gave birth to three sons--Jayanta, Rsabha and Midhusa.
Vamanadeva is actually the Supreme Personality of Godhead, but He appeared to have been "born" as one of the brothers of Indra. Although Vamanadeva is sometimes taken as a less important demigod, He is actually the maintainer of Indra, the King of the demigods. Thus, although sometimes Vamanadeva is considered to be a subordinate demigod, His actual position is that of the supreme whole, the source of the entire demigod system.