Question: Batavi is the fourth full-length album by which Dutch pagan / Viking / folk metal band, album's title and album's theme are reference to the Batavi?
Context: Moonsorrow is a Finnish pagan metal band formed in Helsinki in 1995.  Musically, the band incorporates elements of black metal and folk metal in their sound.  The band call their sound "epic heathen metal" and try to distance themselves from the term "Viking metal".  They have distanced themselves from other folk metal bands, emphasising that their music is pagan and spiritual and is challenging for its listeners, rather than happy or danceable.  The band members have varying levels of pagan belief but they draw on pagan spirituality for lyrics and inspiration. For One Pagan Brotherhood is the first full-length album by Argentine pagan metal, folk metal band Tersivel.  The album was released on February 26, 2011 through Trinacria Media. Land is the fourth full-length album by the Faroese Viking / folk metal band Týr.  It is a multilingual album with vocals in Faroese, English, Norwegian, Danish in Sinklars Vísa and Icelandic in Brennivín.  It was released on May 30, 2008 through Napalm Records.  The album is based on Nordic folklore.  The final track is a new version of the song "Hail to the Hammer" which originally appeared on a demo in 2000, and again on "How Far To Asgaard" in 2002. The Batavi were an ancient Germanic tribe that lived around the modern Dutch Rhine delta in the area that the Romans called Batavia, from the second half of the first century BC to the third century AD.  The name is also applied to several military units employed by the Romans that were originally raised among the Batavi.  The tribal name, probably a derivation from "batawjō" ("good island", from Germanic "bat-" "good, excellent," which is also in the English "better," and "awjō" "island, land near water"), refers to the region's fertility, today known as the "fruitbasket of the Netherlands" (the Betuwe). Furor Gallico is a Celtic metal and Folk metal band that had originated in Milan, Italy.  The band was formed by a collaboration among Melissa (past member, bass), Stefano (guitar) and Becky (Celtic harp) in 2007.  The band was formed upon the idea of playing new school Italian folk metal.  They have released only one demo album and two full-length album so far.  Pagan was later added for vocals and Marco played the drums.  Furor Gallico have songs in both English and in Italian, the band members take alternating roles in who writes the lyrics and composes the music in either language.  The song Curmisagios was even written in dialetto brianzolo, a lombard dialect spoken in the area of Brianza, in western Lombardy. <ref name="http://www.heavyworlds.com/">Heavy Worlds http://www.heavyworlds.com/site/index.php/interviews/item/7095-furor-gallico-band Retrieved 1 December 2013</ref> Batavi is the fourth full-length album by the Dutch pagan / Viking / folk metal band Heidevolk.  It was released on March 2, 2012 through Napalm Records.  The album's title and album's theme are reference to the Batavi (Germanic tribe). Wodan Heerst is an EP by the Dutch Pagan/folk metal band Heidevolk.  The first track is a track on Heidevolk's following studio album, Walhalla Wacht.  The second track is a remixed version of a song featured on Heidevolk's previous release, De Strijdlust is Geboren; it features more violin than the previous version.  The third and final track off this album is a cover of a song by the band Normaal.  The lyrics can be read as a simple catechism of Wodan and his acts, mainly describing his quests for divine wisdom, interspersed with prayers to and praise of the god. Velua is the fifth full-length album by the Dutch pagan / Viking / folk metal band Heidevolk.  It was released on March 20, 2015 through Napalm Records. Everything Remains (As It Never Was) is the fourth full-length album by the Swiss folk metal band Eluveitie.  The album was produced by Colin Richardson, and released on February 19, 2010 through Nuclear Blast. Visions from the Spiral Generator is the fourth full-length album by Swedish progressive/folk metal band Vintersorg.  It was released on 24 June 2002.  This album saw a drastic shift in style in the band that was foreshadowed on the band's prior album, "Cosmic Genesis".  The lyrics continued to be mixed between English and Swedish, and the music continued to be even more progressive and technical, moving farther away from the band's original folk influences.
Answer: Heidevolk