Vexillum of Roman Empire — The vexilloid of the Roman Empire was a red banner with the letters SPQR in Gold surrounded by a gold wreath hung on a military standard topped by a Roman eagle or an image of the goddess Victoria made of silver or bronze
Photo Credit: By Ssolbergj - CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=4249122

Flag of Andronikos Palaiologos — Device of the Byzantine emperor Andronikos II Palaiologos, in the so-called "Flag of Andronikos Palaiologos" kept in the Vatopedi Monastery. By Original design ca. 1330 AD; sketch by Bernhard von Koehne - Bernhard v. Koehne, "Vom Doppeladler", pp. 1–26, in Berliner Blätter für Münz-, Siegel- und Wappenkunde, Vol. 6, 1871–1873, Tafel LXVII.6,
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=65013938

Byzantine Empire in 555 AD, under Justinian I —
Photo Credit: By m654z - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=71830602

Justinian I — cropped from photo of Justinian Mosaic at San Vitale in Ravenna
Photo Credit: By Meister von San Vitale in Ravenna - The Yorck Project (2002) 10.000 Meisterwerke der Malerei (DVD-ROM), distributed by DIRECTMEDIA Publishing GmbH. ISBN: 3936122202., Public Domain, https://commons.wikimedia.org/w/index.php?curid=6435925

Apuleius — cropped
Photo Credit: By Unknown - Bridgeman Art Library, Public Domain, https://commons.wikimedia.org/w/index.php?curid=18273048

Emperor Julian — Portrait of Julianus Apostata ( Julian the Apostate) on a bronze coin from Antiochië, 360-363.
Photo Credit: By Classical Numismatic Group, Inc. http://www.cngcoins.com, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=395388

Iamblichus —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=377647

Porphyry —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=638632

Proclus —
Photo Credit: http://atlantipedia.ie/samples/proclus-lycaeus/

Thoreau's birthplace — Wheeler-Minot Farmhouse in Concord, Massachusetts
Photo Credit: By John Phelan - Own work, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=9464944

Thoreau in 1854 —
Photo Credit: By Samuel W. Rowse - www.walden.org/Institute/Images/VII.%20Rowse.jpg, Public Domain, https://commons.wikimedia.org/w/index.php?curid=4628813