The Templar Hierarchy
The original Latin Rule of 1128 CE consisted of only four ranks. This stands to reason, as at this early stage (eleven years after the founding of the order), there were still very few members. Some Historians claim that the order did not accept any new recruits for the first nine years. Desmond Seward, in his book, "The Monks of War" claims that they may have difficulties in finding members.
"A document of 1123 refers to Hugues as Master of the Knights of The Temple but his little band was merely a voluntary Brotherhood; recent research seems to indicate that they [the Templars] were having difficulty in finding recruits and were on the verge of dissolution. Hugues had come [to Bernard of Clairvaux] about another crusade, not to ask for a rule."
The Monks Of War - Desmond Seward - Penguin Books
If this is true then Bernard's support of the order brought to light in his "In Praise of The New Knighthood" may very well have not only increased it's membership, but saved it from an early end. Regardless, the Templar knights did survive to grow to huge numbers, which required a larger Hierarchy than the original four divisions. What follows are the ranks of the Templar ladder:
The Templar Hierarchy
The Grand Master
Absolute ruler over the order answered only to the Papacy
Seneschal
Acted as both deputy and advisor to the Grand Master
Commander of the Kingdom of Jerusalem
Was in charge of The area and had same powers as Grand Master within his own jurisdiction
Commander of the City of Jerusalem
Was in charge of the area and had same powers as Grand Master within his own jurisdiction
Commander of Tripoli and Antioch
Was in charge of the area and had same powers as Grand Master within his own jurisdiction
Drapier
The Drapier was in charge of the Templar Garments
Commander of Houses
Acted as lieutenants to higher authorities within the order but carried little actual power themselves
Commander of Knights
Like the Commander of houses, acted as lieutenants to higher authorities within the order. They carried little actual power themselves
Knight Brothers
These were the warriors who wore the white tunic and cross. Each was equipped with three horses and armaments
Turcoplier
The purpose of the Turcolier was to command the brother sergeants in battle. The Turcopolier would lead the march along with a guard of knights
Under Marshal
The Under marshal was in charge of the footmen and the equipment
Standard Bearer
The Standard Bearer was one of the sergeants and charged with carrying the order's banner
Sergeant Brothers
These warriors were support troops and did not have to be nobly born. Although similarly equipped to a full knight, the sergeants had one horse and no squires under them
Turcopoles
These were the local troops who would fight along side the Templars. Similar to the sergeants
Sick and Elderly Brothers
No longer active members but still members of the order
http://www.templarhistory.com/hierarchy.html