Ancesttral were a groove/thrash metal band from São Paulo active from 2003 until their split-up, drawing on classic US thrash influences — Metallica, Pantera, Slayer, Anthrax — while incorporating modern groove and alternative metal textures. Their discography includes the debut full-length The Famous Unknown (2007) and Web of Lies (2016), the latter a well-reviewed eleven-track album that showcased a heavier, more polished direction.

Ancient Age is a black metal band from Atibaia, São Paulo, formed in 2023 and operating in the raw underground tradition. Their lyrical themes center on darkness, anti-Christianity, blasphemy, occultism, and medieval subjects, placing them squarely within the Brazilian black metal underground that has produced countless independent acts from the greater São Paulo region.

Ancient Gate is a one-person Argentine black metal project helmed by Ildrac, who performs all instruments and vocals. Citing Darkthrone, Judas Iscariot, and early Blut Aus Nord as reference points, the project debuted in 2019 with From the Shadow Lands and followed it in 2020 with Empire Beyond Dusk, alongside a split release with fellow Argentine act Wintaar titled Morbid Gates of Winter.

Ancient Land were a pagan black/death metal band from Embu das Artes, on the outskirts of São Paulo, who blended black and death metal with symphonic elements and themes of freedom, paganism, nature, and anti-Christianity. Their Bandcamp catalogue includes the releases In My Solitude…, In the Name of the Cross…, The Symphony of War, and Destroys the Lies before the band dissolved.

Ancient Monument is a black metal band from Governador Valadares, Minas Gerais — a city already known in Brazilian metal circles as the birthplace of gothic doom pioneers Silent Cry. Formed in 2020, the band operates in the underground black metal tradition and releases music independently through Bandcamp.

Ancient Ritual is a pagan metal project from Caxias do Sul, Rio Grande do Sul, built around a deliberately raw, 90s-style black metal aesthetic with an ambient vocal timbre as its sonic signature. Their Bandcamp releases include Moonlit Rites of the Damned, The Dark Age, Ars Goetia, and Congressus Cum Daemone, all exploring themes of battles, southern lands, and pagan philosophy.

Ancient Tower is an epic doom metal project from São Paulo, created in 2017 by Mateus Henrique, who also works under the banners Black Sun Void and Gateways to Oblivion. The project explores slow, heavy, atmospheric doom with releases including the album Darkened Horizons and a series of demos, all self-released through Bandcamp.

Ancientblood is a black metal band from Ilha do Governador, a district of Rio de Janeiro, with roots tracing back to an earlier project that later evolved into the raw black metal act Vinterthron. The name is a deliberate reference to the Scandinavian black metal origins the band draws from, and the project has produced raw rehearsal and pre-production material released through Ashen Productions.

Ancienterror is a death/thrash metal band from Santiago, Chile, formed in 2002 from the ashes of Missing Sequence, and has remained active in the city's underground scene ever since. The band released the EP "Arguments for Aggression" in 2007 and has built its lyrical identity around anti-religious, anti-globalization, and anti-capitalist themes.