The Pallava dynasty existed from 275 to 897, ruling a significant portion of the Deccan, also known as Tondaimandalam. The Pallavas played a crucial role in shaping in particular southern Indian history and heritage. The dynasty rose to prominence after the downfall of the Satavahana Empire, whom they had formerly served as feudatories.

The Pallavas became a major southern Indian power during the reign of Mahendravarman I (600–630) and Narasimhavarman I (630–668), and dominated the southern Telugu region and the northern parts of the Tamil region for about 600 years, until the end of the 9th century. Throughout their reign, they remained in constant conflict with both the Chalukyas of Vatapi to the north, and the Tamil kingdoms of Chola and Pandyas to their south. The Pallavas were finally defeated by the Chola ruler Aditya I in the 9th century.

The Pallavas are most noted for their patronage of Hindu Vaishnava temple architecture, the finest example being the Shore Temple, a UNESCO World Heritage Site in Mamallapuram. Kancheepuram served as the capital of the Pallava kingdom. The dynasty left behind magnificent sculptures and temples, and are recognized to have established the foundations of medieval southern Indian architecture, which some scholars believe the ancient Hindu treatise Manasara inspired. They developed the Pallava script, from which Tamil Script and Grantha ultimately took form. This script eventually gave rise to several other Southeast Asian scripts such Khmer. The Chinese traveller Xuanzang visited Kanchipuram during Pallava rule and extolled their benign rule.

The word Pallava means a creeper or branch in Sanskrit. Pallava also means arrow or spruce in Tamil.

The origins of the Pallavas have been debated by scholars. The Mahakuta Pillar inscription of Kirttivarman I claims that Dramila term to describe Pallavas. "Dramila" is a term, often used interchangeably with "Dravida," referring to the ancient Tamil kingdoms and their people) Kadavas were related to the Pallava dynasty and ruled from Kudalur near Cuddalore in Tamil Nadu. Hiranyavarman, the father of Nandivarman II Pallavamalla is said to have belonged to the Kadavakula in epigraphs. The title Kadava is found among the several titles assumed by Mahendravarman I, Narasimhavarman I and Narasimhavarman II. It describe the Pallava kings used the kadava title. The Kadava name with Kadavarayar is found in Tamil literature to refer to the Pallavas. The relationship of the Kadavas to the main Pallava dynasty is documented in an inscription in Kanchipuram. The kings of the collateral line of the Pallavas who were descended from Bhimavarman, the brother of Simhavishnu, are called the Kadavas. The Pallava king Nandivarman II (Pallavamalla) is praised as "one who was born to raise the prestige of the Kadava family." The available historical materials include three copper-plate grants of Sivaskandavarman in the first quarter of the 4th century, all issued from Kanchipuram but found in various parts of Andhra Pradesh, and another inscription of Simhavarman I half century earlier in the Palnadu (Pallava Nadu) area of the western Guntur district. All the early documents are in Prakrit, and scholars find similarities in paleography and language with the Satavahanas and the Mauryas. Their early coins are said to be similar to those of Satavahanas. Two main theories regarding the origins of the Pallavas have emerged based on available historical data. The first theory suggests that the Pallavas were initially subordinate to the Satavahanas, a ruling dynasty in the Andhradesa region (north of the Penna River in modern-day Andhra Pradesh). According to this theory, the Pallavas later expanded their influence southward, eventually establishing their power in Kanchi (modern-day Kanchipuram). The second theory proposes that the Pallavas originated in Kanchi itself, where they initially rose to prominence. From there, they expanded their dominion northward, reaching as far as the Krishna River. Another theory posits that the Pallavas were descendants of Chola Prince Ilandiraiyan and had their roots in Tondaimandalam, the region around Kanchi. These theories provide different perspectives on the Pallavas' early history and territorial expansion, but the exact origins of the Pallava dynasty continue to be a subject of debate among historians.

The proponents of the Andhra origin theory include S. Krishnaswami Aiyangar and K. A. Nilakanta Sastri. They believe that Pallavas were originally feudatories of the Satavahanas in the south-eastern part of their empire who became independent when the Satavahana power declined. They are seen to be "strangers to the Tamil country", unrelated to the ancient lines of Cheras, Pandyas and Cholas. Since Simhavarman's grant bears no regal titles, they believe that he might have been a subsidiary to the Andhra Ikshvakus who were in power in Andhradesa at that time. In the following half-century, the Pallavas became independent and expanded up to Kanchi.

S. Krishnaswami Aiyengar also speculates that the Pallavas were natives of Tondaimandalam and the name Pallava is identical with the word Tondaiyar. Chola Prince Ilandiraiyan is traditionally regarded as the founder of the Pallava dynasty. Ilandiraiyan is referred to in the literature of the Sangam period such as the Pathupattu. In the Sangam epic Manimekalai, he is depicted as the son of Chola king Killi and the Naga princess Pilivalai, the daughter of king Valaivanan of Manipallavam.

Another theory is propounded by historians R. Sathianathaier and D. C. Sircar, with endorsements by Hermann Kulke, Dietmar Rothermund and Burton Stein. Sircar points out that the family legends of the Pallavas speak of an ancestor descending from Ashwatthama, the legendary warrior of Mahabharata, and his union with a Naga princess. According to Ptolemy, the Aruvanadu region between the northern and southern Penner rivers (Penna and Ponnaiyar) was ruled by a king Basaronaga around 140 CE. By marrying into this Naga family, the Pallavas would have acquired control of the region near Kanchi. While Sircar allows that Pallavas might have been provincial rulers under the later Satavahanas with a partial northern lineage, Sathianathaier sees them as natives of Tondaimandalam (the core region of Aruvanadu). He argues that they could well have adopted northern Indian practices under the Mauryan Asoka's rule. He relates the name "Pallava" to Pulindas, whose heritage is borne by names such as "Pulinadu" and "Puliyurkottam" in the region.