Shashanka in the context of "Gauda Kingdom"

Bengal (/bɛnˈɡɔːl/ ben-GAWL) is a geographical, ethnolinguistic, historically geopolitical region in South Asia, located north of the Bay of Bengal. Today, it is politically divided between the sovereign state of Bangladesh, the Indian state of West Bengal, and Karimganj district in the Indian state of Assam.

The ancient Vanga Kingdom is widely regarded as the namesake of the Bengal region. The Bengali calendar dates back to the reign of Shashanka in the 7th century CE. The Pala Empire was founded in Bengal during the 8th century. The Sena dynasty and Deva dynasty ruled between the 11th and 13th centuries. By the 14th century, Bengal was absorbed by Muslim conquests in the Indian subcontinent. An independent Bengal Sultanate was formed and became the eastern frontier of the Islamic world. During this period, Bengal's rule and influence spread to Assam, Arakan, Tripura, Bihar, and Odisha (formerly- Orissa). Bengal Subah later emerged as a prosperous part of the Mughal Empire.

Gauḍa (also known as Gaur, Gour, Lakhnauti, Lakshmanavati and Jannatabad) is a historic city of Bengal in the eastern part of the Indian subcontinent, and one of the most prominent capitals of classical and medieval India, being the capital city of Bengal under several kingdoms. The Gauḍa region was also a province of several pan-Indian empires. During the seventh century, the Gauda Kingdom was founded by King Shashanka, whose reign corresponds with the beginning of the Bengali calendar. Gour gradually became synonymous with Bengal and Bengalis. It was conquered by Bakhtiyar Khalji, a lieutenant of the Ghurid ruler Muhammad of Ghori in 1203.

For a period of 112 years, between 1453 and 1565, Gauda was the capital of the Bengal Sultanate. In 1500, Gauda was the fifth-most populous city in the world, with a population of 200,000, as well as one of the most densely populated cities in the Indian subcontinent. The Portuguese left detailed accounts of the city. The Sultans built a citadel, many mosques, a royal palace, canals and bridges. Buildings featured glazed tiles.

The Bengali calendar or Bangla calendar (Bengali: বঙ্গাব্দ, romanized: Bôṅgābdô, colloquially বাংলা সন, Bāṅlā Sôn or বাংলা সাল, Bāṅlā Sāl, "Bangla Year") is a solar calendar used in the Bengal region of the Indian subcontinent. In contrast to the traditional Indian Hindu calendar, which begins with the month Chaitra, The Bengali calendar starts with Baishakh. A revised version of the Bangladeshi calendar is officially used in Bangladesh, while an earlier, traditional version continues to be followed in the Indian states of West Bengal, Tripura, and Assam. The Bengali calendar began in 590–600 CE to commemorate the ascension of Shashanka, the first independent king in Bengal's unified polity. Some modifications were done to the original calendar during Mughal emperor Akbar's era, to facilitate the collection of land revenue at the start of the Bengali harvesting season. The first day of the Bengali year is known as Pohela Boishakh (1st of Boishakh) which is a public holiday in Bangladesh.

The Bengali era is called Bengali Sambat (BS) and has a zero year that starts in 593/594 CE. It is 594 less than the AD or CE year in the Gregorian calendar if it is before Pohela Boishakh, or 593 less if after Pohela Boishakh.

The Shailodbhava (IAST: Śailodbhava) dynasty ruled parts of eastern India during the 6th-8th centuries. Their core territory was known as Kongoda-mandala, and included parts of the present-day Ganjam, Khordha and Puri districts in the Odisha state. Their capital was located at Kongoda, which is identified with modern Banapur.

The early rulers of the dynasty were feudatories to Shashanka. The Shailodbhava ruler Madhavaraja II seems to have assumed sovereignty soon after 620 CE. The dynasty declined in the 8th century, and their territory came under the Bhauma-Kara rule.

Gauḍa (also known as Gaur, Gour, Lakhnauti, Lakshmanavati and Jannatabad) is a historic city of Bengal in the eastern part of the Indian subcontinent, and one of the most prominent capitals of classical and medieval India, being the capital city of Bengal under several kingdoms. The Gauḍa region was also a province of several pan-Indian empires. During the seventh century, the Gauda Kingdom was founded by King Shashanka, whose reign corresponds with the beginning of the Bengali calendar. Gour gradually became synonymous with Bengal and Bengalis. It was conquered by Bakhtiyar Khalji, a lieutenant of the Ghurid ruler Muhammad of Ghori, in 1203.

For a period of 112 years, between 1453 and 1565, Gauda was the capital of the Bengal Sultanate. In 1500, Gauda was the fifth-most populous city in the world, with a population of 200,000, as well as one of the most densely populated cities in the Indian subcontinent. The Portuguese left detailed accounts of the city. The sultans built a citadel, many mosques, a royal palace, canals, and bridges. Buildings featured glazed tiles.