From http://www.eso-skillfactory.com/en/build/templar/stamplar-tank/7892/

This build is focused to find an equilibrium between dmg intake and output, a high sustainability and attack power was the goal of this build.

Race
I personally play this build with an Orc, which increases my health regeneration in combat and increase max health, stamina, and melee dmg. For this build any race is preferable which has an increase in health or stamina -regen- (Nord, Redguard, Imperial etc.).

Gear
Armor
When playing solo, wear 5 pieces of medium armor and 2 pieces of heavy.
When you are tanking with a healer, you can switch to 5 heavy and 2 medium. Also the used skills will be different, those will be discussed below.
If you have the undaunted passive a light belt is a possibility as well.
The legs and chest have the 'infused' trait with health enchant and all other pieces 'divines' with stamina enchant.

The armor can all be crafted.
For solo play go for recovery and damage with 5 pieces of 'Willow's path', and for the remaining pieces 'Night mother's Gaze'.
For group play go for resistances and health with 5 piece Song of Lamae and the rest Alessia's Bulwark.

Weapons
For the weapons use a one-hand/shield and a 2-Hander, all 'Night Mother's Gaze' (solo) or Alessia's Bulwark (group).
The weapons have the 'precise trait for solo and 'defending' trait for group with 'absorb stamina' enchantment. Shield has the 'infused' trait with stamina enchantment

Jewelry
The Endurance set or other stamina increasing jewelry with stamina cost reduction enchants (decrease stamina costs enchant affects all abilities; including break free , dodge roll, and blocking).

Skills
The skills can be swapped based on whether you are playing solo or in a group and/or doing PvE or PvP.

PvE
Always have 'Radiant Aura' on both bars, and 'Blazing Shield' and 'Absorb Magi' on the one-H/shield bar. 'Radiant Aura' is needed to keep your resources up even when you are switching between bars, and 'Blazing Shield' and 'Absorb Magi'for tanky situations.

The skill set-up displayed in the Skill Calculator is the solo PvE set-up. When tanking the following skills will be replaced:

'Reverberating Bash' for 'Pierce Armor'
- Bash not needed when tanking, switch it for a taunt.
'Stampede for 'Purifying Ritual'
- Charge not needed, ritual very helpfull to cast away dots
'Biting Jabs' for 'Channeled Focus'
- The AoE dmg is not needed, switch it for the nice extra resistance and magicka regen. Perfect to maintain the 'Blazing Shield.
'Rally' for 'Luminous Shards'
- In a group the 'Luminous Shards' is always appreciated, more than 'Rally'