The boroughs of Liverpool, Knowsley, St Helens and Sefton were included in Merseyside. In Greater Manchester the successor boroughs were Bury, Bolton, Manchester, Oldham (part), Rochdale, Salford, Tameside (part), Trafford (part) and Wigan. Warrington and Widnes, south of the new Merseyside/Greater Manchester border were added to the new non-metropolitan county of Cheshire. The urban districts of Barnoldswick and Earby, Bowland Rural District and the parishes of Bracewell and Brogden and Salterforth from Skipton Rural District in the West Riding of Yorkshire became part of the new Lancashire. One parish, Simonswood, was transferred from the borough of Knowsley in Merseyside to the district of West Lancashire in 1994. In 1998 Blackpool and Blackburn with Darwen became independent unitary authorities. 

The Duchy of Lancaster is one of two royal duchies in England. It has landholdings throughout the region and elsewhere, operating as a property company, but also exercising the right of the Crown in the County Palatine of Lancaster. While the administrative boundaries changed in the 1970s, the county palatine boundaries remain the same as the historic boundaries. As a result, the High Sheriffs for Lancashire, Greater Manchester and Merseyside are appointed "within the Duchy and County Palatine of Lancaster".
What is one of two royal duchies?
Where are they?
In what country?
How many countries were included in Merseyside?
When did the administrative boundaries change?
How are the High Sheriffs appointed?
Which parish was transferred from the borough?
In what year?
Which became independent unitary authorities in 1998?
Which districts became part of the new Lancashire?
Which boundaries remain the same as the historic ones?
In Greater Manchester, were there successor boroughs?
What was the name of the two that started with "B"?
Which were south of the new Merseyside/Greater Manchester border?
What were they added to?
The Duchy of Lancaster
The Duchy of Lancaster is one of two royal duchies in England
The County Palatine of Lancaster.
 but also exercising the right of the Crown in the County Palatine of Lancaster.
England
The Duchy of Lancaster is one of two royal duchies in England
Four
The boroughs of Liverpool, Knowsley, St Helens and Sefton were included in Merseyside
The 1970s
While the administrative boundaries changed in the 1970s
Within the Duchy and County Palatine of Lancaster.
As a result, the High Sheriffs for Lancashire, Greater Manchester and Merseyside are appointed "within the Duchy and County Palatine of Lancaster"
Simonswood
One parish, Simonswood, was transferred from the borough of Knowsley in Merseyside to
1994
 One parish, Simonswood, was transferred from the borough of Knowsley in Merseyside to the district of West Lancashire in 1994.
Blackpool and Blackburn with Darwen
In 1998 Blackpool and Blackburn with Darwen became independent unitary authorities
The districts of Barnoldswick and Earby, Bowland Rural District.
The urban districts of Barnoldswick and Earby, Bowland Rural District and the parishes of Bracewell and Brogden and Salterforth from Skipton Rural District in the West Riding of Yorkshire became part of the new Lancashire.
Lancaster
While the administrative boundaries changed in the 1970s, the county palatine boundaries remain the same as the historic boundaries.
Yes
In Greater Manchester the successor boroughs were Bury, Bolton, Manchester, Oldham (part), Rochdale, Salford, Tameside (part), Trafford (part) and Wigan.
Bury and Bolton
In Greater Manchester the successor boroughs were Bury, Bolton,
Warrington and Widnes
Warrington and Widnes, south of the new Merseyside/Greater Manchester border
Cheshire
Warrington and Widnes, south of the new Merseyside/Greater Manchester border were added to the new non-metropolitan county of Cheshire. 