Karl Alexander, 5th Prince of Thurn and Taxis, full German name: "Karl Alexander Fürst von Thurn und Taxis" (22 February 1770, Imperial City of Regensburg, Holy Roman Empire, 15 July 1827, Schloss Taxis, Dischingen, Kingdom of Württemberg) was the fifth Prince of Thurn and Taxis, head of the Thurn-und-Taxis-Post, and Head of the Princely House of Thurn and Taxis from 13 November 1805 until his death on 15 July 1827.
 With the death of his father on 13 November 1805, he became nominal "Generalpostmeister" of the Imperial Reichspost until the resignation of Francis II, Holy Roman Emperor.
Fritz von Thurn und Taxis (born "Friedrich" Leonhard Ignatius Josef Maria Lamoral Balthasar Thurn and Taxis [full German name: "Friedrich Leonhard Ignatius Josef Maria Lamoral Balthasar Thurn und Taxis"] on 22 June 1950 in Linz, Upper Austria, Allied-occupied Austria) is an Austrian journalist and a member of the Bohemian line of the Princely House of Thurn and Taxis.
 He became well known as a longtime sportscaster on the Bayerisches Fernsehen television channel.
 Since 1993, Thurn und Taxis has been a football commentator on the pay television channel Sky Deutschland.
Prince "Victor" of Thurn and Taxis (German: "Viktor Theodor Maximilian Egon Maria Lamoral Prinz von Thurn und Taxis" ; 18 January 1876, Ecska – 28 January 1928, Vienna, Austria ) was a member of the Princely House of Thurn and Taxis and a Prince of Thurn and Taxis.
Maximilian Maria Carl Joseph Gabriel Lamoral, 7th Prince of Thurn and Taxis, full German name: "Maximilian Maria Carl Joseph Gabriel Lamoral Fürst von Thurn und Taxis" (24 June 1862, Schloss Taxis, Dischingen, Kingdom of Württemberg – 2 June 1885, Regensburg, Bavaria, Germany) was the seventh Prince of Thurn and Taxis and Head of the Princely House of Thurn and Taxis from 10 November 1871 until his death on 2 June 1885.
Franz Joseph Maximilian Maria Antonius Ignatius Lamoral, 9th Prince of Thurn and Taxis, full German name: "Franz Josef Maximilian Maria Antonius Ignatius Lamoral Fürst von Thurn und Taxis" (21 December 1893, Regensburg, Kingdom of Bavaria – 13 July 1971, Regensburg, Bavaria, Germany) was the ninth Prince of Thurn and Taxis and Head of the Princely House of Thurn and Taxis from 22 January 1952 until his death on 13 July 1971.
The House of Thurn and Taxis, a princely dynasty which was sovereign until mediatized in 1806 and its noble status de-recognized following the fall of the German Empire in 1918, exists through several extant lines descending from Alexander Ferdinand, 3rd Prince of Thurn and Taxis.
 The rule of succession is agnatic primogeniture, which only allowed males to succeed to the main princely title so long as male members of the family survive.
 The current Head of the House of Thurn and Taxis is Albert, 12th Prince of Thurn and Taxis, whose historic style is "His Serene Highness" Albert, Prince of Thurn and Taxis.
Indigo is a 2012 board game developed by Reiner Knizia and published by Ravensburger.
Max Emanuel Prinz von Thurn und Taxis (born 7 September 1935) is the heir presumptive to the nominal "Fürst von Thurn und Taxis" title held, according to the traditional house law of the former German princely House of Thurn and Taxis, by his nephew Albert, 12th Prince of Thurn and Taxis.
 Max Emanuel is a member of the former German princely House of Thurn and Taxis, whose wealth derives from founding the German postal service and brewing.
 These preparations were defeated however, after locals and a conservation society managed to get a local referendum held in 1997 to scrap the plans.
 Max Emanuel continued his plans four years later to build a hotel and golf course on the same site.
 People living nearby were upset that the view seen from the castle's grounds would be ruined by new construction meant for tourists; consequently the local council ruled that most of the land surrounding the castle was unusable for commercial development.
 Max Emanuel responded to these complaints by saying a luxury hotel would draw wealthy visitors to the village and help the local economy; restaurant, shop owners, and other members of the tourist industry tended to favor his plans, while village counselors, local farmers and others were opposed, believing that any commercial development would ruin the rural landscape and create too much noise.
 Those in favor of King Ludwig's legacy stated that the hotel would violate the romantic legacy the mad king left.
Prince Gabriel Albert Maria Michael Franz Joseph Gallus Lamoral of Thurn and Taxis (German: "Gabriel Albert Maria Michael Franz Joseph Gallus Lamoral Prinz von Thurn und Taxis" ) (16 October 1922 – 17 December 1942) was a member of the Princely House of Thurn and Taxis and a Prince of Thurn and Taxis.
 Gabriel was second in the line of succession to the Headship of the House of Thurn and Taxis after his father Franz Joseph, Hereditary Prince of Thurn and Taxis until his death in the Battle of Stalingrad, at which point he was replaced by his uncle Prince Karl August of Thurn and Taxis.
Thurn and Taxis is a board game designed by Karen and Andreas Seyfarth and published in 2006 by Hans im Glück in German (as "Thurn und Taxis") and by Rio Grande Games in English.
 In the game, players seek to build postal networks and post offices in Bavaria and surrounding areas, as did the house of Thurn und Taxis in the 16th century.
 The game won the prestigious 2006 Spiel des Jahres award.

Question: how is Indigo and Thurn and Taxis related?
Answer: board game