Question: What does Robert Croc and Crookston Castle have in common?

Context articles: Rosshall Academy
Crocket
Berkhamsted Castle
Brady Barr
Cardiff Castle
Steve Irwin
Robert Croc
Crookston Castle
Robert Laidlaw
Castle town

Rosshall Academy is a secondary school in the Crookston area of Glasgow.
 The school was formed in August 1999 to merge Penilee Secondary School and Crookston Castle Secondary School and moved to a new building on Crookston Road in 2002.
 It holds over 1,100 pupils.
A crocket (or, croquet) is a hook-shaped decorative element common in Gothic architecture.
 The name derives from the diminutive of the French "croc", meaning "hook", due to the resemblance of crockets to a bishop's crosier.
Berkhamsted Castle is a Norman motte-and-bailey castle in Berkhamsted, Hertfordshire.
 The castle was built to obtain control of a key route between London and the Midlands during the Norman conquest of England in the 11th century.
 Robert of Mortain, William the Conqueror's half brother, was probably responsible for managing its construction, after which he became the castle's owner.
 The castle was surrounded by protective earthworks and a deer park for hunting.
 The castle became a new administrative centre of the former Anglo-Saxon settlement of Berkhamsted.
 Subsequent kings granted the castle to their chancellors.
 The castle was substantially expanded in the mid-12th century, probably by Thomas Becket.
Brady Robert Barr (born January 4, 1963) is a herpetologist and currently the host of Nat Geo WILD's "Dangerous Encounters with Brady Barr".
 He began employment with National Geographic in 1997.
 Barr has also been the host for two other series, "Reptile Wild" and "Croc Chronicles".
Cardiff Castle (Welsh: "Castell Caerdydd" ) is a medieval castle and Victorian Gothic revival mansion located in the city centre of Cardiff, Wales.
 The original motte and bailey castle was built in the late 11th century by Norman invaders on top of a 3rd-century Roman fort.
 The castle was commissioned either by William the Conqueror or by Robert Fitzhamon, and formed the heart of the medieval town of Cardiff and the Marcher Lord territory of Glamorgan.
 In the 12th century the castle began to be rebuilt in stone, probably by Robert of Gloucester, with a shell keep and substantial defensive walls being erected.
 Further work was conducted by Richard de Clare, 6th Earl of Gloucester, in the second half of the 13th century.
 Cardiff Castle was repeatedly involved in the conflicts between the Anglo-Normans and the Welsh, being attacked several times in the 12th century, and stormed in 1404 during the revolt of Owain Glyndŵr.
Stephen Robert Irwin (22 February 1962 – 4 September 2006), nicknamed "The Crocodile Hunter", was an Australian zookeeper, conservationist and television personality.
 Irwin achieved worldwide fame from the television series "The Crocodile Hunter" (1996–2007), an internationally broadcast wildlife documentary series which he co-hosted with his wife Terri; the couple also hosted the series, "Croc Files" (1999–2001), "The Crocodile Hunter Diaries" (2002–2006), and "New Breed Vets" (2005).
 Together, the couple also owned and operated Australia Zoo, founded by Irwin's parents in Beerwah, about 80 km north of the Queensland state capital city of Brisbane.
Sir Robert Croc, posthumously often referred to as Sir Robert de Croc in reference to Crookston Castle), was an Anglo-Norman knight and landowner in Scotland in the High Middle Ages.
 He was given the Levern valley in Scotland by King David I of Scotland in 1170.
Crookston Castle is located in the Pollok area of south-west Glasgow, Scotland.
 The castle is located some 5 miles (8 km) south-west of the city centre, and 3 miles (5 km) east of Paisley, overlooking the Levern Water, just before its confluence with the White Cart Water.
Robert Alexander Crookston Laidlaw {'1': ", '2': ", '3': ", '4': "} (8 September 1885 – 12 March 1971) was a New Zealand business man who founded the Farmers Trading Company, one of the largest department store chains in New Zealand.
 He was also a Christian writer and philanthropist and a well-known lay preacher in the Open Brethren movement.
A castle town is a settlement built adjacent to or surrounding a castle.
 Castle towns were common in Medieval Europe.
 Some examples include small towns like Alnwick and Arundel, which are still dominated by their castles.
 In Western Europe, and England particularly, it is common for cities and towns that were not castle towns to instead have been organized around cathedrals.